User:QuackGuru/Sand 15

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https://www.nytimes.com/2020/03/30/health/vaping-juul-international.html

https://web.archive.org/web/20221008102138/https://www.nytimes.com/2020/06/02/health/puff-bar-teens.html

[1] [1]

https://pubmed.ncbi.nlm.nih.gov/?term=pod+mod&filter=pubt.meta-analysis&filter=pubt.review&filter=pubt.systematicreview&size=200

https://pubmed.ncbi.nlm.nih.gov/?term=pod+mod&filter=years.2021-2021&size=200


Juul e-cigarette with pods.
Juul e-cigarette with pods
General structure of e-cigarettes comprised of a liquid pod, heating mechanism, battery and a battery life indicator using a LED light.
General structure of e-cigarettes comprised of a liquid pod, heating mechanism, battery and a battery life indicator using a LED light.[2]

Pod mod electronic cigarettes heat up a liquid containing nicotine, flavors, and other ingredients that creates an aerosol.[3] Pod mods are lightweight, portable,[4] small, and reusable.[5] Pod mods do not require pushing a button.[6] There are numerous pod mods in the marketplace[7] and there are many kinds of pod mods.[8] Many devices rely on replaceable liquid pods that may contain propylene glycol, glycerin, benzoic acid, nicotine, and artificial flavors.[9] Some pod mods can be refillable, with flavors such as cotton candy, donut cream, and gummy bear.[7] Pod mods can look like USB flash drives, cell phones, credit card holders, and highlighters.[10] Because pod mods are small and generate less aerosol, it makes it easy to hide them.[11]

Pod mods have increased in use among adolescents and young adults.[7] Youth who try pod mods seem to have a greater potential to become frequent users than those who try other electronic or traditional cigarettes.[7] Pod mods are the most commonly used nicotine product among youth.[12] They have the potential to be used unobtrusively in areas where smoking is not allowed.[13] Pod mods are more socially appealing than traditional cigarettes among adolescents and young adults.[13] College students in the US stated their distaste for the tobacco flavor and considered it an impendent to both starting and continuing to use e-cigarettes.[14] Despite the clear presence of nicotine in e-cigarettes, adolescents often do not recognize this fact, potentially fueling misperceptions about the health risks and addictive potential of e-cigarettes.[15]

Nicotine is highly addictive and can harm brain development, which continues until about age 25.[16] Pod mods contain high concentrations of nicotine that can lead to nicotine dependence.[17] Pod mods effectively delivers nicotine and as a result magnifies the chance of nicotine dependence among minors.[18] Minors using pod mods are more likely than traditional e-cigarette users to exhibit higher nicotine dependence symptoms.[18] The potential for a continued life-long addiction to nicotine among minors is a significant public health concern.[18] Given the high nicotine concentrations in Juul, the nicotine-related health consequences of its use by young people could be more severe than those from their use of other e-cigarette products.[19] Nicotine poses an array of health risks[20] such as the stimulation of cancer development and growth.[21] Several studies demonstrate it is carcinogenic.[20] Because it can form nitrosamine compounds (particularly N-Nitrosonornicotine (NNN) and nicotine-derived nitrosamine ketone (NNK)) through a conversion process, nicotine itself exhibits a strong potential for causing cancer.[22]

The long-term effects of pod mod use, including their effects on the growing brain, is largely unknown.[13] The liquid pods also contain propylene glycol, which has been shown to induce airway epithelial injury and deep airway inflammation.[9] Research on nicotine salts is limited.[4] Possible health risks of persistent inhalation of high levels of nicotine salts are not known.[4] Principal Deputy Director Dr. Anne Schuchat of the Centers for Disease Control and Prevention stated in September 2019 that the nicotine salts "cross the blood brain barrier and lead to potentially more effect on the developing brain in adolescents."[23] Pod mods deliver higher levels of nicotine than regular e-cigarettes[24] in protonated salt rather than the free-base nicotine form found in earlier generations.[15] There has been a proliferation of pod-based products with high nicotine concentration, triggered by Juul's financial success.[25] Pod mods are heavily marketed, with a particular focus in the way youth can use them discreetly.[26] The prevalence of newer types of e-cigarettes, like Juul, with greater levels of nicotine is a public health disaster.[27]

Usage

Prevalence

A person using a Juul device.
A person using a Juul device

Pod mods have increased in use among adolescents and young adults[7] and are more popular among youth and young adults in contrast to traditional e-cigarettes.[28] Pod mod devices have become popular among teenagers as a socially acceptable alternative to conventional cigarettes due to their stylish design (e.g. USB or teardrop shape), wide selection of flavors, and user-friendly functions.[29] Among youth and adults, pod mods have been a quickly rising public health issue in 2021.[30] Youth who try pod mods seem to have a greater potential to become frequent users than those who try other electronic or traditional cigarettes.[7] The explosion in e-cigarette use in the US was associated with Juul that was available in a myriad of flavors.[31] Pod mods were the most commonly used nicotine product among youth in 2018.[12] Minors in the US do not have any major problem in obtaining vaping products online or from friends and family members.[31]

Flavors. which are especially enticing to youth. have been prohibited in the US from use in closed-cartridge devices such as Juul.[31] The revised US FDA rules would emphasize the ban of flavored cartridges or pod-based vaping products to curb their appeal to youth, but this rule did not apply to tobacco flavored or menthol flavored cartridges, tobacco flavored or menthol flavored pod-based vaping products, flavored non-reusable vaping products, or refillable flavored e-liquids.[32] For this reason, numerous flavored e-cigarette products were still in the marketplace, which has resulted in a surge in the utilization of non-reusable e-cigarettes among middle and high school students in the US from 2019 to 2020.[32]

In December 2017, Juul was the top-selling e-cigarette brand in the US.[16] By April 2022, Vuse was at 35.1% and Juul was at 33.1% of the market in the US.[33] Vuse lead increased to 39.7%, while Juul's market share in the US slumped to 28.1% by September 2022.[34]

A 2018 study stated that 80% of people aged 15 to 24 who experimented with Juul persisted using the device and comments on social media stating "addicted to my Juul" were frequent.[5] Pod mods comparable to Juul have the potential to be used unobtrusively in areas where smoking is unlawful.[13] The escalation in use of vaping products including pod mods seems to be associated with the millions of youth who had seen the advertisements of such products.[13] "Exemplifying concern with youth uptake and use of e-cigarettes in general and pod-based e-cigarettes in particular, the US Food and Drug Administration released a statement in April 2018 on new enforcement actions and a Youth Tobacco Prevention Plan to stop youth use of, and access to, JUUL (brand name for a pod-based e-cigarette) and other e-cigarettes," a 2018 report stated.[35]

External video
- Students Are Hiding Vaping Devices In Plain Sight | TODAY

Pod mods used by youth on school property and during class is seemingly pervasive.[8] News outlets and social media sites report widespread use of Juul by students in schools, including in classrooms and bathrooms.[16] Schools are having difficulty to stop students from using pod mods in restrooms, hallways, and classrooms.[36] Some schools do not allow any USB flash drives on their property because many pod mods look like USB flash drives.[5] School districts have started educating parents and teachers about pod mods.[5] The educational school programs teach how to find out if their son or daughter or a student is using a pod mod.[5] E-cigarette devices are compact and inconspicuous, resembling a USB flash drive, and are easy to conceal from authority figures, facilitating widespread use even in the classroom.[19] In 2017, students had commented on Twitter about using the Juul device in class.[37] Their likeness to an USB memory stick allows them to be discretely used in no smoking areas and easily concealed from parents, contributing to a new widespread phenomenon, known as "stealth vaping".[29] E-cigarette use has become so pervasive among youth that it is impossible to go to the bathroom in many middle and high schools because so many people are "Juuling" (i.e. vaping).[19] In response, several Massachusetts high schools have started to lock the bathrooms in order to prevent e-cigarette use during the school day.[19] Parents may not realize that their child is vaping.[38] For example, just 44.2% of parents of middle school and high school students were able to recognize a Juul device.[38]

Subsequent youth smoking initiation

Teens who vape are more likely to start using tobacco products.[26] Youth who vape are more likely than non-users to start smoking cigarettes, and the higher nicotine concentrations in Juul might heighten the likelihood of this transition.[19] Juul vaping among youth could result in gateway effects, such as starting smoking or cannabis use, is an area of concern.[39] Many studies have confirmed a gateway effect from early nicotine use, and many pod-based nicotine products, like Juul and disposable e-cigarettes, have high levels of nicotine that result in rapid addiction by users.[40] E-cigarette use not only results in the dual use of nicotine products but also leads to nicotine and cannabis product use, a practice of growing concern to researchers as cannabis becomes legal in more countries.[40]

Motivation

Pod mods are more socially appealing than traditional cigarettes among adolescents and young adults.[13] Pod mods made e-cigarette use more appealing because of their convenience, design, ease of concealment, and flavors, though college students in the US stated their distaste for the tobacco flavor and considered it an impendent to both starting and continuing to use e-cigarettes.[14] For example, a male sophomore student in the US stated that "if they eliminated everything but the tobacco pods, I would probably stop [vaping]."[14] Youth may be using pod mods because they think these devices are safer to use.[13] Juul and other vaping companies have stated they want to provide users a more similar cigarette-like experience in order to entice to smokers.[41] The enticement of flavored vape pods to small children could cause them to drink the liquid.[13]

Public perception

Despite the clear presence of nicotine in e-cigarettes, adolescents often do not recognize this fact, potentially fueling misperceptions about the health risks and addictive potential of e-cigarettes.[15] A 2018 study found 63% of respondents aged 15 to 24 were not aware that every Juul product contains nicotine.[5]

Construction

Pod mods heat up a liquid containing nicotine, flavors, and other ingredients that creates an aerosol.[3] Pod mods are lightweight, portable,[4] small, and reusable.[5] Pod mods do not require pushing a button.[6] A pod mod does not require much of a learning curve.[6] With the majority of pod mods, users can just open their new package, put a pod into the device, and begin vaping.[5] They are charged using a USB port.[6] There are numerous pod mods in the marketplace[7] and there are many kinds of pod mods.[8] The three categories for the different kinds of pod mods are an open system, a closed system, or those that use both.[8]

Pod mods come in many shapes, sizes, and colors.[42] They also come in come in varying flavors.[43] Common pod mod brands include Juul and Suorin.[42] Many devices rely on replaceable liquid pods that may contain propylene glycol, glycerin, benzoic acid, nicotine, and artificial flavors.[9] Some pod mods can be refillable, with flavors such as cotton candy, donut cream, and gummy bear.[7] Pod mods that contain tetrahydrocannabinol (THC), the primary psychoactive chemical of cannabis, are being sold.[7] There are compatible prefilled pod cartridges that contain nicotine, THC, or cannabidiol (CBD) with or without flavoring.[42] Users may hack closed systems (such as pod/cartridge devices) to refill these cartridges with other substances.[42] Pod mods can look like USB flash drives, cell phones, credit card holders, and highlighters.[10] Because pod mods are small and generate less aerosol, it makes it easy to hide them.[11] There are pod mods that can be concealed in the palm of a person's hand.[11] Later-generation pod mods are small like a Sharpie pen.[6] YouTube videos teach viewers how to conceal Juul devices, with one video concealing a Juul device inside a Sharpie pen.[26] Pod mods cost about half as much as larger e-cigarettes.[6]

Graphic from the 2019 Centers for Disease Control and Prevention's report entitled E-cigarettes Shaped Like USB Flash Drives: Information for Parents, Educators and Health Care Providers.
Graphic from the 2019 Centers for Disease Control and Prevention's report entitled E-cigarettes Shaped Like USB Flash Drives: Information for Parents, Educators and Health Care Providers[16]

Health effects

Safety

The long-term effects of pod mod use, including the effects on the growing brain, is largely unknown.[13] In sampling multiple e-cigarette delivery systems, a 2019 study found Juul pods were the only product to demonstrate in vitro cytotoxicity from both nicotine and flavor chemical content, in particular ethyl maltol.[9] Vape liquid pods may contain numerous other compounds and are known to provide unreliable nicotine delivery that is often inconsistent with the labeling.[9] A 2019 study testing popular pod mods from the US showed that 81% of them contained B-D-glucan and 23% contained endotoxin.[44]

These liquid pods also contain propylene glycol, which has been shown to induce airway epithelial injury and deep airway inflammation.[9] Many vape pods contain the flavoring chemicals diacetyl and 2,3-pentanedione.[9] These two specific compounds have been shown to directly alter the transcriptional profiles of primary human bronchial epithelial cells grown at air–liquid interface, phenotypically leading to impaired ciliogenesis.[9] The enticing pod flavoring to young children could result in them ingesting the liquid.[13] Youth regularly use more than one pod at a time, and as a consequence they may be unsuspectingly become exposed to toxic doses of nicotine that can have short-term and long-term health risks.[45]

Nicotine carcinogenicity

Nicotine poses an array of health risks[20] such as the stimulation of cancer development and growth.[21] The International Agency for Research on Cancer does not consider nicotine to be a carcinogen, though several studies demonstrate it is carcinogenic.[20] Because it can form nitrosamine compounds (particularly N-Nitrosonornicotine (NNN) and nicotine-derived nitrosamine ketone (NNK)) through a conversion process, nicotine itself exhibits a strong potential for causing cancer.[22] About 10% of breathed in nicotine is estimated to convert to these nitrosamine compounds.[22] Nitrosamine carcinogenicity is thought to be a result of enhanced DNA methylation and may lead to an agonist response on the nicotinic acetylcholine receptors, which acts to encourage tumors to grow, stay alive, and penetrate into neighboring tissues.[22]

Nicotine salt

Bravo nicotine salt e-liquids.
Bravo nicotine salt e-liquid

E-cigarettes containing nicotine salts aim to increase smoker's satisfaction by improving blood nicotine delivery and other sensory properties.[46] Research on nicotine salts is limited.[4] Possible health risks of persistent inhalation of high levels of nicotine salts are not known.[4] The long-term consequences of inhaling benzoic acid at the levels observed in nicotine salt e-liquids is unknown.[47] "Juul products use nicotine salts, which can lead to much more available nicotine," Principal Deputy Director Dr. Anne Schuchat of the Centers for Disease Control and Prevention stated in September 2019.[23] She also stated that the nicotine salts "cross the blood brain barrier and lead to potentially more effect on the developing brain in adolescents."[23] Consequences of breathing in the nicotine salt aerosols on pregnant women and fetuses is not known.[48]

Nicotine salts used in later-generation devices may also have altered pharmacodynamics and acute effects relative to e-liquids containing free-base nicotine (conventionally used in e-liquids).[49] For instance, a 2021 study found that nicotine salt-based e-liquid had a more acidic pH (protonated) relative to more basic conventional (unprotonated) e-liquid; they postulated that this reduces systemic bioavailability because protonated nicotine has poorer membrane permeability.[49] Conversely, the authors of the 2021 study suggested that protonated nicotine is more likely to result in acute lung damage, as this is the form that binds to nicotinic acetylcholine receptors (which activate inflammatory immune responses) lining the lung epithelium.[49] These receptors are also expressed on macrophages; accordingly, alveolar macrophage production of inflammatory cytokines is enhanced in the presence of nicotine-containing e-cigarette aerosol condensate compared to nicotine-free e-cigarette aerosol condensate.[49]

Nicotine delivery

External video
What you should know about vaping and e-cigarettes

The latest generation of e-cigarettes, "pod products," such as Juul, have the highest nicotine content (59 mg/mL), in protonated salt, rather than the free-base nicotine form found in earlier generations, which makes it easier for less experienced users to inhale.[15] Nicotine salt e-liquids have become so succusful that they provoked a "nicotine arms race."[50] Pod mods deliver higher levels of nicotine than regular e-cigarettes[24] and can expose users to nicotine levels that are similar to regular cigarettes.[14] They also increase blood levels of nicotine faster than cig-a-likes and advanced vaping devices.[51]

Prior to Juul hitting the market, 3% was the greatest amount of nicotine available from many companies.[52] One nicotine pod, in terms of nicotine, is roughly equivalent to one pack of regular cigarettes.[53] According to the manufacturer, a single Juul pod contains as much nicotine as a pack of 20 regular cigarettes.[16] A Juul pod containing 0.7 ml or 59 mgmg/mL (5%) of nicotine is equivalent to about 20 traditional cigarettes.[5] Each Juul pod could provide as much as 200 puffs.[54] The labels on products state pods contain 59 mg/mL of nicotine, but the levels can be considerably greater such as 75 mg/mL of nicotine.[7] Some pod mods contained greater levels of nicotine than Juul which were as high as 6.5%.[25] The majority of e-liquids contained 1% to 3% nicotine before Juul hit the market.[55] Given the high nicotine concentrations in Juul, the nicotine-related health consequences of its use by young people could be more severe than those from their use of other e-cigarette products.[19] The prevalence of newer types of e-cigarettes, including Juul, with greater levels of nicotine is a public health catastrophe.[27]

Tests show that the pod mods Juul, Bo, Phix, and Sourin contain nicotine salts in a solution with propylene glycol and glycerin.[4] Fontem Ventures, a unit of Imperial Brands, created myBlu pods that contain nicotine salts in a mixture with free-base nicotine and lactic acid.[41] The Juul pod mod e-liquid has a protonated nicotine content that is seven times greater than in a traditional blu e-cigarette e-liquid.[56] Nicotine salt is present in e-liquid as a product of combination of nicotine and various acids, such as glycolic, pyruvic, lactic, levulinic, fumaric, succinic, benzoic, salicylic, malic, tartaric and citric acids.[57] A nicotine base and a weak acid such as benzoic acid or levulinic acid is used to form a nicotine salt.[3] Benzoic acid is the most used acid to create a nicotine salt.[25] A free-base nicotine solution with an acid reduces the pH, which makes it possible to provide higher levels of nicotine without irritating the throat.[26] Nicotine salts are thought to amplify the level and rate of nicotine delivery to the user.[4] The speed of nicotine salts uptake into the body is close to the speed of nicotine uptake from traditional cigarettes.[58] Juul delivers nicotine 2.7 times faster than other e-cigarettes.[19] Grant O'Connell, overseer of scientific affairs at Imperial Brands, indicated that nicotine salts are able to go far deeper into the lungs than the free-base nicotine.[41] Since nicotine is absorbed quicker through the lungs, nicotine salts can more closely mimic the nicotine delivery experience from the use of regular cigarettes than nicotine in free-base nicotine e-liquids, according to O’Connell.[41] This means, according to O’Connell, that more of the nicotine in free-base nicotine e-liquids goes to the upper respiratory tract where it is absorbed into the blood more slowly.[41] Michael Siegel, a tobacco control advocate, said on October 16, 2019 at a subcommittee of Congress' House Committee on Energy and Commerce hearing that "The use of nicotine salts allows the nicotine to be absorbed into the bloodstream much more quickly, simulating the pattern you get with a real cigarette."[59]

Nicotine salts are less harsh and less bitter, and as a consequence e-liquids that contain nicotine salts are more tolerable even with high nicotine concentrations.[25] Regular e-cigarette e-liquids contain free-base nicotine in which higher nicotine levels can be unpleasant to the user.[5] Traditional cigarettes provide high levels of nicotine, but with the bad taste of smoking.[5] Pod mods, however, can provide high levels of nicotine without the negative smoking experience.[5] The amount of nicotine uptake from pod mod use among youth is greater than among those who use traditional cigarettes.[13] In a 2018 study of adolescent pod users, their urinary cotinine (a breakdown product used to measure nicotine exposure) levels were higher than levels seen in adolescent cigarette smokers.[15]

Metals

Heavy metals have been detected in the vape aerosols produced from pod-type vapes, including chromium, nickel, copper, zinc, cadmium, tin, manganese, and lead.[60] The metallic components of e-cigarette devices, such as the filaments and coils, are comprised of such heavy metals and can degrade when exposed to oxidized acidic e-liquids.[60] While metal exposure is a risk factor for multiple pulmonary diseases including respiratory inflammation, asthma, COPD, and respiratory cancer, the health effects of metal exposure in e-cigarette users is still largely unknown.[60]

Cardiovascular effects

The figure shows general mechanisms of action by which inhalation of e-cigarettes' aerosol can promote cardiovascular diseases.
The figure shows general mechanisms of action by which inhalation of e-cigarettes' aerosol can promote cardiovascular diseases.[61]

Several in vitro and in vivo studies describing the mechanisms of the impact of e-cigarettes on the cardiovascular system have been published.[61] These include mechanisms associated with nicotine or other components of the aerosol or thermal degradation products of e-cigarettes.[61] It remains uncertain that the cardiovascular effects of pod mod use will lead to a significant harm reduction in issues associated with cardiovascular disease.[62]

Nicotine has systemic hemodynamic effects that are mediated by the activation of the sympathetic nervous system.[61] Thus, acute nicotine treatment can stimulate cardiac output by producing systemic vasoconstriction and increasing heart rate.[61] A 2022 study found that "Pod-based Electronic Cigarette (PEC) use had comparable short-term and long-lasting impacts on vascular function, BP, and HR as conventional cigarette use among young and healthy adults. Findings indicated that PECs release volatile organic compound (VOC) chemicals that have toxic effects on the blood vasculature."[40]

Inhaling e-cigarettes (Juul with nicotine) acutely increased sympathetic neural outflow in young, healthy non-smokers.[61] In contrast, inhalation of a placebo e-cigarette without nicotine elicited no sympathetic dominance.[61] Therefore, the sympathetic dominance produced by e-cigarettes is mainly produced by nicotine.[61]

A 2021 study concluded that Juul and other pod mods increased the blood pressure by 6 mm Hg acutely in comparison to nicotine-free e-cigarettes.[61] Nevertheless, the authors of this study have mentioned that the 6 mmHg of increase could be underestimated because the participants were not experienced e-cigarette users, which means there could of been less nicotine absorption.[61]

Respiratory effects

The significant concentrations of flavorings in Juul e-liquids can harm or destroy lung cells.[30]

Alcohol effects

The figure shows the potential for e-cigarettes to enhance lung tissue injury. Alcohol negatively impacts the lung via direct and indirect mechanisms. As with cigarette smoking, e-cigarettes generate compounds known to enhance alcohol-mediated lung injury leading to both increased risk for infections and pneumonia as well as the exacerbation of existing chronic inflammatory lung diseases such as bronchitis, emphysema, and COPD.
The figure shows the potential for e-cigarettes to enhance lung tissue injury.[63] Alcohol negatively impacts the lung via direct and indirect mechanisms.[63] As with cigarette smoking, e-cigarettes generate compounds known to enhance alcohol-mediated lung injury leading to both increased risk for infections and pneumonia as well as the exacerbation of existing chronic inflammatory lung diseases such as bronchitis, emphysema, and COPD.[63]

Given the relative newness of e-cigarettes, such as Juul, as of 2020, there is a limited body of literature detailing the role e-cigarettes play in alcohol consumption, how inaccurate perceptions of e-cigarettes contribute to risk-taking behaviors related to alcohol consumption, and the pathogenic damages that occur during dual use.[63] Given the long history of the comorbidity of alcohol and nicotine use, the rising prevalence of e-cigarettes raises the question as to their role in the consumption of alcohol.[63] The use of nicotine enhances the pleasurable effects felt during alcohol consumption and increases cravings for it.[63]

E-cigarette users have an increased risk of alcohol misuse, such as binge drinking or chronic use, when compared with non-e-cigarette users.[63] Although fundamentally different, it has been suggested that the body's response to e-cigarette use may be similar to that of cigarettes with a few unique differences.[63] Alcohol interferes with normal innate lung immunity, particularly the physical barriers and cellular functions.[63] The metabolism of alcohol produces acetaldehyde, superoxide compounds, hydrogen radicals, and hydrogen peroxides, further promoting lipid peroxidation and generation of malondialdehyde and 4-Hydroxynonenal.[63] Chronic alcohol consumption is associated with bacterial pneumonia, viral lung infections such as respiratory syncytial virus, and accumulation of fluid in the lungs due to epithelial barrier dysfunction as seen in acute respiratory distress syndrome.[63]

The use of e-cigarettes has potentially pathogenic health effects on the lungs.[63] Cell types, including human fibroblasts, neutrophils, airway epithelial cells, human embryonic stem cells, and mouse neural stem cells, demonstrate morphological changes, even displaying cytotoxicity in stem cells and fibroblasts when exposed to undiluted e-liquid and flavor aldehydes.[63] E-cigarette use impairs physical barriers in the innate immune system of the lungs.[63] E-cigarette decrease cilia, potentially as a result of ROS production.[63] Similarly, excessive amounts of alcohol blunt cilia responses.[63] In combination, s-cigarettes with alcohol use disorder may further slow CBF similar to that of cigarettes and alcohol, leading to an impaired ability to clear pathogens and debris from the airway.[63] While it has not been investigated, alcohol use disorder may exacerbate the COPD-related symptoms seen in e-cigarette users.[63] A 2020 review hypothesizes that dual use of e-cigarette and alcohol may interfere with normal lung function, may contribute to the pathogenesis of COPD-like illnesses greater than single-substance users, and leave the dual user more susceptible to bacterial and viral infection.[63]

Addiction and dependence

Nicotine is highly addictive and can harm brain development, which continues until about age 25.[16] Pod mods contain high concentrations of nicotine that can lead to nicotine dependence.[17] A 2021 review found that "The speed of delivery to the bloodstream and the relative physical tolerability of vaping compared with smoking may engender higher blood nicotine levels and greater symptoms of nicotine dependence."[64] Pod mods effectively delivers nicotine and as a result magnifies the chance of nicotine dependence among minors.[18]

Minors using pod mods are more likely than traditional e-cigarette users to exhibit higher nicotine dependence symptoms.[18] Early use of nicotine has the cability to induce neurological alterations that give rise to higher intensity of dependence symptoms and increased drug use.[18] Nicotine dependence may enhance susceptibility to different kinds of tobacco marketing.[18] Nicotine dependence may also enhance peer or social pressures that encourage utilizing different kinds of tobacco products.[18] Teens may find it hard to interpret the amount of nicotine they are getting from a vape liquid, and this may result in greater nicotine use and subsequent nicotine addiction.[38] The potential for a continued life-long addiction to nicotine among minors is a significant public health concern.[18]

A 2022 review states that, "Although marketed as a smoking cessation tool, nicotine delivery through e-cigarettes can result in higher levels of nicotine in serum when compared to traditional tobacco cigarettes. For example, a recent study in rats compared the serum levels of nicotine after exposure to e-vapor (JUUL and previous generation e-cigarettes) versus CS (Marlboro Red cigarettes, produced by Philip Morris USA Inc.). JUUL e-vapor delivered 136.4 ng/ml of nicotine, which is substantially higher than the 17.1 ng/ml delivered by other e-cigarettes and 26.1 ng/ml delivered by Marlboro cigarettes. This study concluded that e-cigarettes are not safer than traditional cigarettes."[65]

History

Puff Bar and Juul comparison. Left: Puff Bar device; right: Juul device
Puff Bar and Juul comparison.[66] Left: Puff Bar device; right: Juul device.[66]

In June 2015, Juul introduced a pod mod device.[35] British American Tobacco stated that they have been using nicotine salts in their US Vuse e-liquid brand since 2012.[41] Solace Technologies started selling nicotine salts in 2015.[67] It was reported in 2017 that Philip Morris International is developing an e-cigarette called STEEM that uses nicotine salts.[68] R. J. Reynolds Vapor Company launched in 2018 a pod mod device similar to Juul's device called Vuse Alto.[69]

Juul had a dominant market position by 2018, accounting for more than 70% of US e-cigarette sales.16 17 18 During this time, overall US sales of e-cigarettes doubled, with Juul being responsible for the bulk of market growth.[70] The popularity of the Juul pod system has led to a flood of other pod devices hitting the market.[71] There has been a proliferation of pod-based products with high nicotine concentration, triggered by Juul's financial success.[25] As of September 2018, there were no less than 39 similar Juul devices as well as 15 Juul-compatible pods being offered.[25]

Altria, manufacturer of Marlboro, announced in 2018 that it would halt sales of MarkTen Elite and MarkTen Apex due to concerns that vaping is proliferating in use among children.[72] In December 2018, Altria announced that it would cease selling all of its e-cigarette products.[73] Atria announced in December 2018 that it would buy a 35% stake in Juul for $12.8 billion.[74]

An organization named Parents Against Vaping E-cigarettes was started by frustrated parents whose children were using Juul.[75] The origination deployed activists in the majority of US states to push for anti-vaping laws and affect policy discussions with respect to vaping in city halls and statehouses.[75]

On June 23, 2022, the US FDA issued marketing denial orders (MDOs) to Juul Labs Inc. for all of their products currently marketed in the United States.[76] As a result, the company must stop selling and distributing these products.[76] After reviewing the company’s premarket tobacco product applications (PMTAs), the US FDA determined that the applications lacked sufficient evidence regarding the toxicological profile of the products to demonstrate that marketing of the products would be appropriate for the protection of the public health.[76] In particular, some of the company's study findings raised concerns due to insufficient and conflicting data – including regarding genotoxicity and potentially harmful chemicals leaching from the company's proprietary e-liquid pods – that have not been adequately addressed and precluded the FDA from completing a full toxicological risk assessment of the products named in the company's applications.[76] "The FDA is tasked with ensuring that tobacco products sold in this country meet the standard set by the law, but the responsibility to demonstrate that a product meets those standards ultimately falls on the shoulders of the company," said Michele Mital, acting director of the FDA's Center for Tobacco Products.[76] "As with all manufacturers, Juul had the opportunity to provide evidence demonstrating that the marketing of their products meets these standards. However, the company did not provide that evidence and instead left us with significant questions. Without the data needed to determine relevant health risks, the FDA is issuing these marketing denial orders."[76]

On June 24, 2022, the US Court of Appeals for the D.C. Circuit entered a temporary administrative stay of the marketing denial order for Juul Labs Inc.[76] The court notes the purpose of this administrative stay is to give the court sufficient opportunity to consider petitioner's forthcoming emergency motion for stay pending court review and should not be construed in any way as a ruling on the merits of that motion.[76] On June 27, 2022, Juul requested that the US Court of Appeals for the D.C. Circuit to put on hold for what it believed was an "extraordinary and unlawful" decision by the US FDA when earlier in the month it ruled the company to refrain from selling its vaping products.[77]

In response to the US FDA trying to ban Juul products from the US market, Karen E. Knudsen, CEO of the American Cancer Society Cancer Action Network, stated in part, "In the time Juul products were on the market unregulated, these products and Juul’s marketing strategies significantly contributed to the youth e-cigarette crisis we currently face in this nation and led to new, previously unimaginable, levels of addiction among youth. Given research shows youth who use e-cigarettes are more likely to use combustible cigarettes, preventing youth addiction to these products is critical to preventing tobacco-related cancers."[78]

Puff Bar, which was founded in 2019, offered disposable devices in excess of 20 flavors.[79] Building on its initial success, they added a range of flavored pods named Puff Krush.[79] Elf Bar began offering pod mod devices in 2022.[80]

Black market pod mod products

There is a flourishing illicit market for pod mods.[81]

Sales to youth

Many youth purchase Juul pod products from illicit sources because they are underage.[45]

Regulation

Amid the epidemic levels of youth use of e-cigarettes and the popularity of certain products among children, the US Food and Drug Administration (US FDA) on January 20, 2020 issued a policy prioritizing enforcement against certain unauthorized flavored e-cigarette products that appeal to kids, including fruit and mint flavors.[82] Under this policy, companies that do not cease manufacture, distribution and sale of unauthorized flavored cartridge-based e-cigarettes (other than tobacco or menthol) within 30 days risk US FDA enforcement actions.[82] Beginning 30 days from the date of January 20, 2020 of the notice of availability of this guidance in the Federal Register, the US FDA intends to prioritize enforcement against these illegally marketed ENDS products by focusing on the following groups of products that do not have premarket authorization: Any flavored, cartridge-based ENDS product (other than a tobacco- or menthol-flavored ENDS product); All other ENDS products for which the manufacturer has failed to take (or is failing to take) adequate measures to prevent minors' access; and Any ENDS product that is targeted to minors or likely to promote use of ENDS by minors.[82] Cartridge-based ENDS products are a type of ENDS product that consists of, includes, or involves a cartridge or pod that holds liquid that is to be aerosolized when the product is used.[82] For purposes of this policy, a cartridge or pod is any small, enclosed unit (sealed or unsealed) designed to fit within or operate as part of an ENDS product.[82]

There is a limit on the nicotine content, meaning the nicotine strength of e-liquid cannot exceed 20 mg/ml (2.0%), while refillable e-liquids cannot exceed 10 ml in the UK.[83] Refill liquids in the EU with more than 20 mg/ml of nicotine may be sold with prior authorization from the pharmaceutical regulation.[84]

Marketing

Marketing efforts on social media benefited pod mods to control 72% of the US vaping market in 2018.[7] Advertisements state nicotine salt liquids contain 2 to 10 times more nicotine than those found in the majority of regular e-cigarette products.[5] Pod mods are heavily marketed, with a particular focus in the way youth can use them discreetly.[26] A marketing strategy is offering youth "skins" to personalize their pod mod.[85] "Skins" are customizable adhesive covers similar to mobile-phone cases.[5] In August 2017, a Twitter advertisement for Juul's "creme brulee" pods suggested to people to retweet it if they savored the "dessert without the spoon."[86] Every pod mod brand promotes a range of flavors.[87] Pod mods have been promoted using celebrity endorsements and social influencers.[18]

The US FDA sent a warning letter in June 2019 to Solace Technologies for failure to include the required nicotine warning statement for their Solace Vapor e-liquid products that were being promoted on social media on their behalf.[88] Under 21 C.F.R. § 1143.3, labeling and advertising for cigarette tobacco, roll-your-own tobacco, and covered tobacco products (other than cigars), such as e-liquid products, must bear the following warning statement: "WARNING: This product contains nicotine. Nicotine is an addictive chemical."[89] It also is unlawful for such tobacco product manufacturer, packager, importer, distributor, or retailer of the tobacco product to advertise or cause to be advertised within the US any tobacco product unless each advertisement bears the required warning statement (21 C.F.R. § 1143.3(b)).[89] Because labeling and/or advertising in the social media posts on behalf of the firm regarding these e-liquid products do not include the required nicotine warning statement for these products, in violation of 21 C.F.R. § 1143.3(a) and/or 21 C.F.R. § 1143.3(b), the e-liquid products are misbranded under section 903(a)(7)(B) of the FD&C Act (21 U.S.C. § 387c(a)(7)(B)).[89]

Advertised nicotine concentration in the liquid pod is not necessarily the same as in the vapor; furthermore, the gaseous phase may contain dangerous substances not reported on the packaging, such as ultrafine particles of propylene glycol, glycerin, and diacetin.[2]

Environmental impact

A garbology study of environmental contamination including ce-cigarette product waste was conducted at 12 public high schools in Alameda, Contra Costa, Marin, and San Francisco counties in California.[90] At each school, researchers systematically scanned the student parking lots and exterior school perimeter areas once during July 2018–April 2019 to collect all e-cigarette product waste, combustible tobacco product waste, and cannabis product waste found on the ground.[90]

Overall, 893 waste items were collected, including 172 (19%) e-cigarette product waste items (nearly all were Juul or Juul-compatible pods and pod caps).[90] Additional scans were conducted at one upper-income area school beginning three months after Juul Labs announced it was removing flavors (except Cool Mint and Classic Menthol) from retail distribution.[90] These additional scans yielded 127 mint, 20 mango, four fruit Juul or Juul-compatible pod caps, and three yellow (banana or mango) Juul-compatible caps.[90]

Other names

Pod mods[24] are variously known as pod-mods,[91] pod-mod devices,[92] pod-Mod e-cigarette products,[93] pod-Mod e-cigarettes,[93] pod-based electronic cigarettes,[18] pod-based e-cigarettes,[18] pod-based nicotine e-cigarettes,[18] pod-based devices,[94] pod-based products,[18] pod products,[15] pod systems,[95] "pod" e-cigarettes,[96] pod ecigs,[18] pod ENDS,[97] pod vaping devices,[97] pod vape devices,[97] pod vapes,[98] or vape pods.[99]

Other devices

E-cigarettes come in a variety of devices including cigarette-like pens, pipes, hookahs, and tanks to simulate a smoking-type experience.[100] The size, shape, and design of later types of e-cigarettes do not emulate the smoking-type experience of traditional cigarettes.[30]

Gallery

References

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