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HomePublic HealthChanging to e-cigarettes could drastically reduce premature deaths

Changing to e-cigarettes could drastically reduce premature deaths

If nearly all tobacco smokers in the US were to make the shift to vaping over a 10-year period, anywhere from 1.6m to 6.6m premature deaths might be avoided, found a modelling study. An accompanying editorial supports banning combustible tobacco products, with  limits to the types and quantities of toxicants in e-cigarette and heat-not-burn tobacco products.

Making the case for e-cigarettes, researchers have calculated the number of lives that might be saved on a population level if nearly all tobacco smokers in the US were to make the shift to vaping over a 10-year period. According to TCTMD, they says that based on their models, anywhere from 1.6m to 6.6m premature deaths might be avoided.

Such a drastic reduction in smoking rates could occur in the real world, lead author Dr David T Levy, (Georgetown University Medical Centre, Washington, DC), is quoted in the report as saying. “There is a reasonable possibility if we implement strong policies against cigarette use and inform smokers of the differences in risk between cigs and e-cigs,” he predicted, suggesting “higher cigarette taxes, large graphic health warnings, bans on product displays, and countrywide smoke-free air laws” might all enable such a shift.”

Another tactic, which the US Food and Drug Administration (FDA) announced its intent to pursue in July 2017, is reducing nicotine in traditional cigarettes to levels that would no longer inspire addiction.

As to what clinicians should be telling their patients now, Levy said: “If you have tried other methods of quitting and failed, e-cigarettes may enable you to quit smoking the more dangerous cigarettes, but the real health gains come from completely quitting e-cigarettes.”

Dr Douglas Jorenby, (University of Wisconsin Centre for Tobacco Research and Intervention, Madison), said the modelling starts to put some parameters around exactly what the “endgame” – eventually eliminating all tobacco use – might entail, “so that it’s less of an abstract, kind of aspirational goal.” That said, he cautioned that the models, while useful, can’t speak to what will happen for individual smokers. Nor can they account for the public-health effect of “dual users” who both smoke and vape, a factor Jorenby described as the “800-pound gorilla.”

In their study, Levy and colleagues compared smoking rates and health outcomes between the “status quo scenario,” wherein there was no use of e-cigarettes, versus two levels of e-cigarette introduction, known as “pessimistic” and “optimistic.”

Under the optimistic scenario, all but 5% of tobacco smokers would switch to vaping over the 10-year period between 2017 and 2026. This model yielded 6.6m fewer premature deaths and 86.7m fewer life-years lost by the year 2100, as compared with the status quo. Under the pessimistic scenario, all but 10% of tobacco smokers began smoking e-cigarettes; here, there would be 1.6m fewer deaths and 20.8m fewer life-years lost.

Individuals aged 15 years as of 2016 in the model stood to gain an extra 6 months of life, “reflecting the increased life span of those who have, or would otherwise have, smoked cigarettes switching to e-cigarettes,” the investigators report.

The report says Jorenby pointed out that e-cigarettes are getting ever better at delivering nicotine. “And yet even with the relatively state-of-the-art models that are out now, virtually no one who I talk to who’s an e-cigarette user or a dual user says that vaping is the same thing as smoking,” he said.

Thus, from a public health standpoint, there remains the question of what happens to people exposed to both tobacco and e-cigarette vapor. “We’re seeing a great deal of that now, at least in the US, where people who are motivated to some degree to quit smoking and are using e-cigarettes to pursue that goal are still continuing to smoke in some circumstances. And partly that is because vaping is not a perfect substitute,” Jorenby explained.

Vaping might become much more appealing if the FDA follows through on its plan to gradually reduce nicotine in cigarettes, he added. “Or there might be advances in the technology, and I’m absolutely sure there are commercial labs that are working on this, to find better ways through vaping to deliver nicotine right into the alveolar bed of the lung… That could be a game changer.”

In an editorial accompanying the paper, Dr Marita Hefler, (Menzies School of Health Research, Casuarina, Australia), also observes that there is an “enormous range of vaporising products available,” making e-cigarettes not only hard to research but challenging to regulate. Yet, she says, this “continuum” of newer products presents an opportunity.

She outlines the divergent yet less than satisfactory approaches to regulating cigarette alternatives – specifically, e-cigarettes and heat-not-burn (HBN) tobacco products – taken around the world, fully 50 years after the harms of combustible tobacco became known.

“The laissez-faire approach to regulation (without taxes or advertising bans) may incentivise the use of both e-cigarettes and HNB over combustible tobacco; however, it may also assist with ‘normalising’ combustible tobacco products,” Hefler points out.

Meanwhile, a “restrictive” approach to regulation that bans the newer products, she adds, “may condemn the declining proportion of smokers who don’t quit to continued use of the most harmful product when a less harmful alternative exists.”

For Hefler, there are several ingredients to successful regulation. First, she supports banning combustible tobacco products from the market. On top of this, “minimum performance standards” can be set to limit the types and quantities of toxicants in e-cigarette and HNB products, she advises. Taxing these products would discourage nonsmokers from trying them, hold the tobacco industry accountable, and provide revenue for covering the costs of treating tobacco-related diseases that will develop in cigarette smokers years after they’ve quit.

Levy et al conclude their paper on an optimistic note. “An endgame scenario for cigarettes might well be within reach, if new technologies for delivering nicotine with substantially less harm, but sufficient satisfaction, are harnessed with sufficient passion and political will to aggressively phase out tobacco cigarettes,” they write.

Introduction: US tobacco control policies to reduce cigarette use have been effective, but their impact has been relatively slow. This study considers a strategy of switching cigarette smokers to e-cigarette use (‘vaping’) in the USA to accelerate tobacco control progress.
Methods: A Status Quo Scenario, developed to project smoking rates and health outcomes in the absence of vaping, is compared with Substitution models, whereby cigarette use is largely replaced by vaping over a 10-year period. We test an Optimistic and a Pessimistic Scenario, differing in terms of the relative harms of e-cigarettes compared with cigarettes and the impact on overall initiation, cessation and switching. Projected mortality outcomes by age and sex under the Status Quo and E-Cigarette Substitution Scenarios are compared from 2016 to 2100 to determine public health impacts.
Findings: Compared with the Status Quo, replacement of cigarette by e-cigarette use over a 10-year period yields 6.6 million fewer premature deaths with 86.7 million fewer life years lost in the Optimistic Scenario. Under the Pessimistic Scenario, 1.6 million premature deaths are averted with 20.8 million fewer life years lost. The largest gains are among younger cohorts, with a 0.5 gain in average life expectancy projected for the age 15 years cohort in 2016.
Conclusions: The tobacco control community has been divided regarding the role of e-cigarettes in tobacco control. Our projections show that a strategy of replacing cigarette smoking with vaping would yield substantial life year gains, even under pessimistic assumptions regarding cessation, initiation and relative harm.

David T Levy, Ron Borland, Eric N Lindblom, Maciej L Goniewicz, Rafael Meza,Theodore R Holford, Zhe Yuan, Yuying Luo, Richard J O’Connor, Raymond Niaura, David B Abrams

[link url="https://www.tctmd.com/news/switching-e-cigarettes-tobacco-could-drastically-curb-premature-death?hootPostID=f9c4033c373dc60b7bc021fdee1554aa"]TCTMD report[/link]
[link url="http://tobaccocontrol.bmj.com/content/early/2017/08/30/tobaccocontrol-2017-053759"]Tobacco Control abstract[/link]

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