Category: Science

  • New Missouri Study Shows Decrease in Teen Vaping

    New Missouri Study Shows Decrease in Teen Vaping

    Credit: Christy Ash

    A new student study in Missouri shows a decrease in teen e-cigarette use. The news was a welcome message to the Springfield-Greene County Health Department

    “Our tag line is saving one breath at a time,” said Springfield-Greene County Community Wellness Coordinator, Cara Erwin. The Springfield-Greene County Health Department says students in the county are taking that message seriously, according to a story on KY3.com.

    “In 2020 it showed that e-cigarette use went down twenty percent from 2018,” said Erwin, adding that the data comes from the students. “Missouri Student Survey is conducted once a year. It’s a survey where students are surveyed on their behaviors and perceptions on substance abuse.”

    Erwin said three main components are the reason it went down in Greene County. The age being raised to purchase tobacco and e-cigarettes, the lung related illnesses from e-cigarettes and the health department’s education seminars on the dangers of smoking.

  • Vapers Warned of Hazards From Dirty Mouthpieces

    Vapers Warned of Hazards From Dirty Mouthpieces

    Vape and e-cigarette users have been warned of the dangers of not cleaning their devices properly over fears harmful bacteria could enter the body from a dirty mouthpiece.

    Suzi Gage, a university academic who studies recreational drug use, said that moisture associated with inhaling vapour could perhaps harbour bacteria. And if the e-cigarette or vaping device was not cleaned regularly enough it could lead to the user becoming ill, she suggested, according to a story in The Daily Mail.

    Gage said “surprisingly little” was known about the health risk of nicotine. “We know what it is about tobacco cigarettes that is so risky to health, it’s the tar, the carbon monoxide, the formaldehyde, the heavy metals and the tens or even hundreds of carcinogens within the tobacco,” she said.

    “These things either are not present in e-cigarettes, they don’t contain tobacco itself, or they might be present but orders of magnitude lower than in cigarettes.

    “Now this doesn’t mean that e-cigarettes are harmless because there might be other aspects of inhaling heated vapour that are risky that we don’t know about yet.

    “For example, perhaps the moisture associated with vapour could harbour bacteria, particularly as these devices are re-used rather than single use in the way that cigarettes are.

    “If you’re an e-cigarette user, have a little think about how often you clean the mouthpiece that you’re putting in your mouth and inhaling your vapour through.”

  • Study: Pod-Style Products Can be More Addictive

    Study: Pod-Style Products Can be More Addictive

    Pod-style vapor products have an efficient delivery of nicotine. A new study by Harvard T.H. Chan School of Public Health finds that the nicotine salts used by the devices may foster greater dependence than other types of e-cigarettes.

    According to the study, the design of pod-based e-cigarettes ensures the delivery of high doses of nicotine in a low pH form, which is less harsh compared to the higher pH nicotine found in most other e-cigarette brands, thus encouraging deeper inhalation.

    This is the first paper to synthesize research findings on Juul and similar pod-based devices, said first author Stella Lee, formerly a National Cancer Institute Cancer Prevention postdoctoral fellow in the Department of Social and Behavioral Sciences and currently an assistant professor at Konkuk University in South Korea, according to the Harvard Gazette.

    “We found that pod-based e-cigarettes have a higher potential to get youth and young adults addicted than other devices,” she said. “To prevent this from happening, we need stronger health communication messages that alert people to these findings.”

    The study will be published online June 1 in JAMA Pediatrics.

  • Opinion: Terminology Causing Confusion Between Nicotine and THC Vapes

    Opinion: Terminology Causing Confusion Between Nicotine and THC Vapes

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    By Charles Gardner 

    The authors of a recent editorial published by a prestigious medical journal write, “most patients with EVALI had inhaled vapor from e-cigarette liquids containing THC.” [emphasis added] In this piece, I will explain why I used to consider the term ‘THC e-cigarettes’ a logical fallacy, and how I have come to believe this original conclusion was wrong. 

    First, let’s review some basic terminology. The word ‘vape’ is a verb; those who vape are ‘vapers’; their devices are ‘vaporizers’. Some vape nicotine, others tetrahydrocannabinol (THC), according to an opinion piece from Foundation for a Smoke-Free World.

    ‘Vaping’ involves heating a liquid to release a liquid aerosol called ‘vapor’. Unlike smoke inhaled from burning plant leaves, vapor contains fewer – and lower levels of – harmful toxins, no solid particulates and no carbon monoxide.

    Products, people, and purposes

    THC and nicotine vaping involve different devices, liquids, supply chains, people, and purposes. The former gets you high (and may relieve pain). The latter may help smokers quit. Evidence suggests that nicotine vaping is safer than tobacco smoking, and this constitutes the central tenet of tobacco harm reduction.

    Because nicotine is not soluble in oil, nicotine vaporizers are designed to produce vapor from aqueous ‘e-liquids.’ In contrast, THC dissolves readily in oil, so THC vaporizers are designed to produce vapor from oils. They use different heating coils and operate at different temperatures than nicotine vaporizers.

    The problem with e-cigarettes

    The term ‘e-cigarette’ was originally chosen to encourage adult cigarette smokers to switch to what many believe are vastly safer alternatives. Advocates for THC vaping and cannabis legalization deliberately avoid the term ‘e-cigarette’ to prevent confusion.

    Over time, however, the perception of ‘e-cigarettes’ has changed, perhaps in part because of negative associations with the deadly products that they were invented to replace. Recently, researchers at the University of California, Davis, made a similar argument.

    Terminological confusion

    During the fall of 2019, health officials in the United States observed a sudden cluster of vaping-related lung injuries. The cause of those injuries was ultimately found to be an adulterant in the bootleg (illicit) THC vape oil supply chain: vitamin E acetate (VEA).

    VEA is soluble in oils, but not soluble in nicotine vape liquids, which are aqueous. So, the US Centers for Disease Control and Prevention (CDC’s) disease terminology — e-cigarette, or vaping, product-use associated lung injuries (EVALI) — seemed problematic for several reasons.

    First, multiple lines of evidence pointed to illicit THC vaping as the cause of EVALI. Second, omitting ‘illicit THC’ from the name could cause real harm if THC consumers continued to vape bootleg products. Third, highlighting ‘e-cigarettes’ in that scary acronym runs the risk of simultaneously encouraging legal nicotine vapers to relapse to smoking, and discouraging adult smokers from quitting.

    The ‘E’ in EVALI still makes many nicotine vapers bristle. “No one calls joints cigarettes,” they say, so “why is the CDC claiming that THC vapes are e-cigarettes?” I used to agree. But there is a problem with that argument.

    ‘Cannabis cigarettes’ are a thing

    Merriam–Webster’s dictionary defines a ‘joint’ as a ‘marijuana cigarette’. Just Google ‘cannabis cigarettes’. They are a thing. They are especially a thing in countries and American states where recreational cannabis is legal, and companies use modern manufacturing methods to produce them.

    The authors above, who referred to “e-cigarette liquids containing THC,” were not deliberately trying to confuse their colleagues by conflating bootleg THC vape oil harms with legal nicotine vaping products. Yet confusion remains. Most people who hear the word ‘e-cigarette’ will think nicotine, not THC.

    Finding a solution

    In my view, there is only one way out of this terminological muddle. In this post, the only way that I could clearly distinguish ‘nicotine vaping’ from ‘THC vaping’ was to use exactly those terms. I now see the term ‘e-cigarette’ itself as a potentially deadly source of confusion. In the COVID-19 era, avoiding terminological confusion could be a matter of life and death.

  • Study: Length of Ring Finger a Factor in Lower Covid-19 Risk

    Study: Length of Ring Finger a Factor in Lower Covid-19 Risk

    Men with longer ring fingers face a lower risk of dying from Covid-19 and are more likely to suffer mild symptoms, researchers claim. Academics found coronavirus death rates in countries where men have shorter ring fingers were up to a third higher.

    Ring finger length is determined by how much testosterone a foetus is exposed to when growing in the womb, the experts said. The more testosterone a male is exposed to in the womb, the longer their ring finger will be, it is believed, according to a story on The Daily Mail.com.

    Testosterone is thought to be protective against severe Covid-19 by increasing the number of ACE-2 receptors in the body. Scientists believe the coronavirus, officially called SARS-CoV-2, enters the body and causes infection through these receptors. 

    But studies also suggest that high levels of ACE-2 receptors can protect against lung damage, which the coronavirus can cause. The new study, carried out by Swansea University, found men with low testosterone levels are twice as likely to die of Covid-19 than men with higher levels. 

    Mounting evidence has shown men are more likely to die from the coronavirus than women – but scientists have been unable to determine exactly why this is. In England and Wales, the Covid-19 death rate for men is 97.5 per 100,000 people compared to 46.5 for females, according to the Office for National Statistics.

    Scientists believe men are less likely to wash their hands, may not seek medical help, and have more underlying health conditions that make them more vulnerable. But testosterone could be one of the key reasons why so many men are dying from coronavirus, doctors believe.

    Swansea University experts added to the theory that men who have low testosterone levels are at more at risk of Covid-19 than other men. They looked at data of 200,000 people in 41 countries where the researchers had already measured the finger lengths of volunteers.

    Some researchers believe finger lengths reflect a foetus’s exposure to testosterone and other hormones that guide development in the womb. The index finger and the ring finger was measured to the closest millimetre. The first measurement is divided by the second measurement to get the 2D:4D ratio.

    The smaller the digit ratio, the longer the ring finger is. The country with the smallest average male right hand digit ratio was Malaysia, with 0.976. The higher the digit ratio, the shorter the ring finger is. Bulgaria has the highest male right hand digit ratio, with 0.99.

    Researchers found that in countries where the male digit ratio was smaller, including Malaysia, Russia and Mexico, the case fatality rate of Covid-19 was lower. And in countries where the male digit ratio was higher, including the UK, Bulgaria and Spain, the case fatality rate was higher.

  • Vaping Less Likely to Become Long-Term Habit

    Vaping Less Likely to Become Long-Term Habit

    Photo: Hazem Mohamad

    While the use of e-cigarettes is increasing, vaping is less likely to lead to a long-term habit than smoking, according to a group of 10 interrelated papers prepared for the ongoing Population Assessment of Tobacco and Health (PATH) study.

    “The most surprising finding was that while we know cigarette smoking is persistent, and we see use of electronic cigarettes, or e-cigarettes, increasing, especially among young people, what we are not seeing is that e-cigarette use is anywhere near as persistent as cigarette smoking,” says Andrew Hyland, chair of health behavior at Roswell Park and scientific lead on the PATH study.

    “Cigarette smokers tend to stay cigarette smokers over time, but e-cigarette users are more likely to discontinue their use over time compared with cigarette smokers. We don’t know why that is.”

    Hyland speculates that cigarettes deliver nicotine more effectively than e-cigarettes. Studies have shown that the types of e-cigarettes used during the data-collection period from 2013 to 2016 didn’t deliver nicotine as efficiently as cigarettes.

    The study also found that e-cigarette use is associated with attempting to quit smoking. E-cigarette users were 20 percent more likely to try quitting cigarette smoking than adult smokers who did not use e-cigarettes.

  • Vapor Group Asks For WHO Misinformation to be Rejected

    Vapor Group Asks For WHO Misinformation to be Rejected

    A vaping advocacy group in New Zealand has asked the Ministry of Health to reject information peddled by the World Health Organization (WHO) which inaccurately and negatively reflects on smoke-free nicotine products.

    The Aotearoa Vapers Community Advocacy (AVCA) has written to Associate Health Minister, Jenny Salesa, calling for New Zealand’s position to support current global scientific evidence instead, according to an article on scoop.co.nz.

    New Zealand’s Ministry of Health is [was] preparing to present at the Ninth Session of the Conference of the Parties (COP9) to the World Health Organisation’s Framework Convention on Tobacco Control (WHO-FCTC) at The Hague, in the Netherlands, this November. However, the conference has now been cancelled due to Covid-19 concerns.

    Director of AVCA, Nancy Loucas, says consumers have been effectively excluded by WHO-FCTC so it is entirely up to the Ministry of Health to represent the interests of the New Zealand public.

    “We need you to represent our interests based on pragmatic decisions based on current scientific evidence and verified information on the benefits of the reduced risk products.

    “There are numerous scientific studies and statistical evidence reports that prove the harms of these products are no more than five percent of the harms of combustible tobacco. Nicotine is no more addictive than caffeine, and hundreds of thousands of smokers worldwide have been successful switching off combustible tobacco using ENDS (electronic nicotine delivery systems), HTPs (heated tobacco products) as well as snus,” AVCA wrote.

    Loucas says despite such evidence, the WHO-FCTC continues to issue information, reports and guidance that contains several inaccuracies regarding e-cigarettes. It insists that ENDS and smokeless alternatives do not help smokers quit smoking; are more harmful than combustible tobacco; and that nicotine is equivalent to heroin in terms of addictiveness.

    She believes the WHO’s position is being influenced by vested interests that provide funds to the organisation. The ‘WHO Global Report on the Tobacco Epidemic 2019’ and the ‘WHO Q&A detail on E-cigarettes’ were written with and funded by individuals who have a vested financial interest in pharmaceutical nicotine replacement therapies in development, she says.

    “This vested interest has coloured the information in order to serve the political and financial interests of Bloomberg Philanthropies and the Gates Foundation who provide nearly half of all the funding for the WHO-FCTC.

    “The WHO is lying to you to protect their own financial interests and keep their private donors happy. They are not objective. They are not focused on their own mandate under FCTC to promote the health of the people and their right to have information to make informed choices regarding their health,” AVCA wrote in its letter to Minister Salesa.

    AVCA continues to call for New Zealand’s confirmed position on smoke-free nicotine products to be publicly released ahead of the Ministry of Health’s presentation at the WHO’s Framework Convention on Tobacco Control at The Hague later this year.

  • Covid-19 Vaccine Ready for Human Trials, Says BAT

    Covid-19 Vaccine Ready for Human Trials, Says BAT

    Photo: Pete Linforth | PixaBay

    British American Tobacco (BAT) said on Friday is ready to test its potential Covid-19 vaccine using proteins from tobacco leaves on humans, after it generated a positive immune response in pre-clinical trials, reports Reuters.

    Once it gets approval from the U.S. Food and Drug administration (FDA) for the vaccine, the company plans to start testing on humans.

    In April BAT announced it was developing a Covid-19 vaccine from tobacco leaves and could produce 1 million to 3 million doses per week if it got the support of government agencies and the right manufacturers.

    Multiple companies from a variety of sectors have been racing to develop a vaccine for Covid-19, with some of the vaccines already in human trials. Experts have suggested that a Covid-19 vaccine could take 12-18 months to develop.

    On Friday, BAT said it had submitted a pre-investigative new drug application to the FDA and that the agency had acknowledged the submission. BAT said it was also talking with other government agencies around the world about the vaccine.

    The company said it has committed funds to conduct clinical trials, which it expects to start as early as late June. BAT has reportedly also invested in additional equipment to boost capacity.

  • Unintended Consequences of India’s Vapor Ban

    Unintended Consequences of India’s Vapor Ban

    Oleksii Terpugov | Dreamstime.com

    A small but burgeoning product category was blighted when India prohibited the import, production, advertising and sale of vapor products in late 2019. The nationwide ban came after several states and union territories had implemented similar restrictions on electronic nicotine-delivery systems (ENDS) in previous years.

    “This was the culmination of a five-year effort to ban e-cigarettes, which began in 2014 when the central government set up three panels to advise on the way forward,” explains Samrat Chowdhery, founder and director of the Association of Vapers India (AVI). “The way these committees were constituted—staffed with anti-tobacco harm reduction [THR] tobacco control experts and government officials—the outcomes were pre-decided and all three recommended a ban.”

    Since then, the government had been turning on the screws. Opposition by consumers and later the vapor industry delayed the process but failed to prevent Parliamentary action. “Because of this uncertainty from the start, the e-cigarette market in India grew haphazardly without the involvement of major industry players and much below its potential,” laments Chowdhery.

    Reliable data on India’s fragmented vapor market at the time of the ban are hard to obtain. Euromonitor reckons that around 0.6 percent of Indians used ENDS in 2018—a figure Chowdhery calls “conservative”—up from the 0.2 percent the World Health Organization (WHO) estimated for 2016–2017.

    With online platforms being the key purchasing channels, according to Euromonitor, the Indian vapor industry comprised mainly small businesses—retailers, wholesalers, e-liquid manufacturers and a few vape shops, according to Chowdhery. “Devices were not made in India, relying solely on imports from China,” he says. “Still, the outlook for the market was good, slated to grow at 60 percent per year until 2022, following Euromonitor’s India report.”

    The devices available catered to middle-class and upper-class segments of the population, who are predominantly cigarette smokers in their 20s to 50s. “This is, however, not to say that vaping technology cannot work for the lower, i.e., bidi-smoking segment,” says Chowdhery. “Devices like the CE6, despite not being manufactured in India—which would bring their cost further down—were available at price points bidi smokers could afford. India is among the largest producers of liquid nicotine, which would allow e-liquids to be made quite cheap. If the industry was encouraged to innovate in this space, more price-friendly solutions could be developed. We did not see a lot of conversion from smokeless tobacco to vaping, though there are some instances. One reason could also be affordability as smokeless products are even cheaper than bidis.”

    Lost opportunity

    In its argument for a ban, India’s government took its cue from the WHO, which supports the prohibition of vapor products and neglects their potential for THR. According to government officials, the ban was enacted amid concerns of youth uptake of vaping—a theory refuted by leading health experts and not fully supported by population data.

    India’s approach is hard to comprehend from a public health perspective, given the number of tobacco users in the country. According to the WHO, India is home to 120 million smokers, representing about 12 percent of the world’s smokers. Only China has more smokers. Most cigarettes consumed in India are bidis, hand-rolled, inexpensive cigarettes that contain more nicotine, carbon monoxide and tar and present a greater risk of oral cancers than conventional cigarettes. An estimated 1 million Indians die from smoking-related diseases each year, the WHO says.

    In addition, India has about 200 million users of smokeless tobacco, including various forms of chewing tobacco snuff and tobaccos that are applied to the teeth and gums. The most popular forms are khaini, zarda, naswar and gutka. While generally perceived as being less hazardous than combustible cigarettes, these products present several health issues. According to a Business Wire report, India’s oral cancer rate is the highest in the world.

    Tobacco, however, is an important economic sector in India, which is the world’s second largest producer and third largest exporter of leaf tobacco. The industry employs roughly 46 million people. According to the Tobacco Board of India, tobacco products contribute more than inr430 billion ($5.65 billion) annually to the government’s tax revenue.

    Contrary to the situation in most countries where combustible cigarettes dominate tobacco consumption, cigarettes and bidis together accounted for only 8 percent of India’s tobacco market in 2018, according to Research and Markets. Nonetheless, cigarette smokers bear an overwhelming share of the tobacco tax burden in India. In the smoked tobacco segment, legal cigarettes accounted for around 10 percent of consumption but approximately 86 percent of tax revenues. Cigarette taxes in India are among the highest in the world. Statista estimates that revenues in the cigarette segment will amount to $13.78 billion in 2020.

    According to Research and Markets, the cigarette market is dominated by ITC with a market share of 84.27 percent (2018). The Indian government has a 28 percent stake in the company. The situation in India is complex, according to Chowdhery. “The Indian government is a major shareholder in the country’s largest cigarette maker, ITC, which likely sees vaping as a threat to its established core business,” he says.

    “Then there are influential tobacco control groups funded by Bloomberg Philanthropies and backed by [the] WHO, which hold a highly prohibitionist mindset. Smoking, primarily cigarettes, which are also the primary market for vaping products, generates a significant amount of tax, which the government relies heavily on. Further, awareness about THR is quite low, starting from the top as was evident from the low-quality debate in Parliament when the vape ban bill was discussed. These factors combine to make a powerful force against vaping, which will take some serious effort to counter,” says Chowdhery.

    Into a black market

    In recent years, the AVI has been pushing back against restricting access to reduced-risk tobacco alternatives, Chowdhery says. “Our efforts are mainly in three categories: legal, lobbying and awareness. In 2016, we moved court against the vape ban in the state of Karnataka and over the next three years filed similar challenges in other states, which had the cumulative effect of delaying the ban for almost two years as the state machinery was forced to reverse positions and find new ways to implement a ban. More recently, we filed another challenge against an ad hoc order of the civil aviation ministry that has led to confiscation of vape devices from air travelers, despite consumption not being banned. We have also reached out to lawmakers to sensitize them to THR as an intervention strategy and have also launched public-facing awareness programs. A small study was done to evaluate the effectiveness and affordability of vaping for bidi smokers with encouraging results.”

    He observes that morale among vapers is low in the wake of the ban, but resilience is building. While some vapers have left advocacy groups, others have become more dedicated to fight the ban. “There are some, especially those who had recently switched and were still on the journey to completely transition to vaping or those who do not have access, that have gone back to smoking,” says Chowdhery. “This is an extremely negative outcome. But there are also many who are trying to figure out alternative means. These are bleak times. The state machinery is in full swing to further demonize vaping and turn public opinion against it while the devices themselves are hard to find.”

    The ban is likely to fuel an illicit e-cigarette market. When states prohibited vapor devices, some started importing vapor products under the “electronic products” category. Enforcement of regulations in India is weak—witness the difficulty authorities have had enforcing state bans on gutka, which is used by more than 25 percent of India’s population.

    Yet there are key differences between the gutka and vapor business, according to Chowdhery. “The gutka industry is primarily run or backed by politicians or those with deep connections, he explains. “It was widely used before the ban so there was a large consumer base; it was not competing with another product, as vaping competes with cigarettes; and the gutka ban left loopholes that were easy to exploit: Gutka makers now sell the areca nut mix and tobacco separately, both of [which] are not individually prohibited. None of these hold for e-cigarettes. It is true, however, that enforcement is lax in India, and as long as there is demand, there will be suppliers to fulfill it.”

    While the ban is recent, Chowdhery is already witnessing a change in market dynamics as established businesses exit and newer, smaller ones adapted to a prohibitionist environment take their place. “This is likely to continue for some time until a new structure emerges, which will also be influenced by enforcement actions and the willingness of the authorities to take them,” he says. “But if the experience of other low-[income] and middle-income countries [LMICs]—Brazil, Mexico, Thailand, etc.—is any indicator, it won’t be long before there is a thriving black market in India. Consumer interests, however, are not best served through this means as there is little control on quality, standards and prices.”

    Missing the target

    In 2017, India set itself the target of “relative reduction in prevalence of current tobacco use by 15 percent by 2020 and 30 percent by 2025.” With tobacco control focusing almost entirely on cigarettes, which account for only a small share of tobacco consumption in India, Chowdhery says it is unlikely that India will achieve its goal.

    “It is evident that a vape ban is both a lost economic and health opportunity,” he says. “After the government ban on e-cigarettes, vapers have been forced to either go back to smoking or resort to a black market, both of which are detrimental to the nation’s health policies and the ban itself. One the one hand, 120 million smokers are deprived of an effective means to quit or reduce harm. On the other [hand], with no quality control over the black market, chances of vapers consuming tainted products and untoward fatalities in the process is a real concern.” 

    Chowdhery does not expect the situation to improve soon unless the courts intervene. The AVI is hoping regulators will allow for some “carve outs” from the ban.  

    “In the meantime, the gap between nations that allow or promote vaping and those like India that have banned it will grow in terms of smoking decline rates and tobacco-related mortality and morbidity,” says Chowdhery. “THR awareness, too, is likely to increase, and demonstration of vaping working for the poorer sections, the bidi smokers, could help convince policymakers of its benefit. Acceptance of THR in smokeless tobacco use, for instance snus replacement for gutka and khaini users, could help expand its application to smoking.

    “The vaping ban is in place; it is a reality we have to accept, and overturning it will be a slow, determined process, though we do have encouraging examples from Canada and the United Arab Emirates, which revised their positions,” concludes Chowdhery. “But it is more likely that things will get worse before they become better as there is now a trend in LMICs, pushed by [the] WHO and Bloomberg Philanthropies, to opt for bans [rather] than regulations.

  • Scientists Urge Caution With Smoking-and-Covid Claims

    Scientists Urge Caution With Smoking-and-Covid Claims

    Image by maja7777 from Pixabay

    Recent studies that have found a disproportionally low number of smokers among Covid-19 patients have not provided direct evidence that smoking is protective against the illness, according to Health Feedback, a nonpartisan, nonprofit organization dedicated to science education.

    Claims that smoking might protect against Covid-19 have been reported in several media outlets and are currently going viral, with more than 410,000 interactions on Facebook in April 2020.

    However, the Health Feedback scientists point out several problems with findings. A French study, for example, did not appropriately factor in comorbidities such as diabetes and hypertension, which can also adversely affect the clinical course of Covid-19, according to the Health Feedback scientists.

    “While the preprint did report the prevalence of such conditions within the combined study cohort of inpatients and outpatients, it did not report age or disease prevalence according to smoking status,” they wrote. “It is therefore unclear whether the nonsmoking group comprised more older individuals and/or those with preexisting health conditions than the other, which might have influenced the results.”

    Other studies showed similar shortcomings, according to the Health Feedback scientists.

    While acknowledging that the findings of disproportionally low numbers of smokers among Covid-19 patients are interesting and deserving of further investigation, the Health Feedback scientists say it would be unwise to begin smoking based on unproven claims that it might protect against Covid-19.