While pointing out the potential drawbacks of vaping, the paper notes: “e-cigarettes may aid in reducing or quitting conventional cigarette smoking, therefore, resulting in substantial harm reduction.”
Initial findings shows that new vapers have a 36x chance of initiating smoking, that is until the authors factored in 14 risk factors. At this point it demonstrated that “lifetime and current e-cigarette use did not significantly increase the risk of current conventional cigarette smoking.”
“This study is among the first studies attempting to estimate the relationship between e-cigarette use and conventional cigarette smoking by using propensity score methods for causal inference, which produce less-biased effect estimates compared to conventional regression adjustment.”
WPSD News wrote that the study “calls into question earlier research that has linked electronic cigarettes to traditional smoking,” and also that “many praised the study's methodology” [link].
Selya added: “Most of the public health community thinks that e-cigarettes act as a 'gateway' to nicotine use, and attract new populations of users,” and, “e-cigarettes might cause youth who use them to transition to use of combustible tobacco products.”
“It's really important to hold off on making policies on e-cigarettes until we have a more solid understanding of its effects. We have to ask what the effect of regulating e-cigarettes would be. At a minimum, existing policies should be continuously re-evaluated as more research comes out."
The study concluded: “This study contradicts some previous work showing that e-cigarette use is associated with a higher likelihood of smoking conventional cigarettes, as this study found no evidence for a role of e-cigarette use in promoting regular and/or current cigarette smoking in youth. One reason for the discrepancy could be methodological: conventional regression control is known to be biased in cases of strong confounding, and some previous literature may reflect unmeasured or unaccounted for confounding.”
Dr. Nicholas Chadi said: “This is a very important study using an innovative methodology.”
Adam Leventhal has been involved in a number of flawed studies purporting to demonstrate a progression from vaping to smoking. Naturally, given his reliance on funding to say this, the academic is none too impressed with work highlighting his shortcomings: “This a cross-sectional study taken at a single snapshot in time.” He claims this makes it “very difficult to draw any conclusions about any causal relation between e-cigarette use and combustible cigarette use."
But he would say that, wouldn’t he?
- “The Relationship Between Electronic Cigarette Use and Conventional Cigarette Smoking Is Largely Attributable to Shared Risk Factors” by Kim and Selya – [link]