In other words, the blatant flaw in this study is that it enrolled smokers who had already made quit attempts using e-cigarettes in the past. By definition, this resulted in a sample of smokers who were more resistant to quitting. One would expect to find lower quitting rates among this population of e-cigarette users.

The FDA is essentially saying that ex-smokers who have quit smoking using electronic cigarettes might as well revert back to smoking, since the Agency is not aware that vaping is any less hazardous than smoking. Is this the kind of scientific-based advice that we think is appropriate to be coming from a federal health agency?

In contrast, however, to the lack of evidence that electronic cigarettes are having any negative public health effects, there is strong evidence to suggest that these products are having a substantial positive public health impact. In particular, there is evidence that not only do these products help many smokers quit smoking, but more generally, they increase population interest in smoking cessation, enhance levels of motivation to quit smoking, and lead to increased quit attempts among current smokers.

Tony Newman, the media relations director for the Drug Policy Alliance, has written a cogent which is a must-read for anyone who has been following The Rest of the Story and its exposition of the strong opposition to vaping from numerous (supposedly) anti-smoking advocates and groups.

Second, in dual users, the total amount of nicotine intake declines. The increase in electronic cigarette use over time is accompanied by a concomitant decline in cigarette smoking. Thus, overall nicotine declines.

2. Propylene glycol and/or glycerin

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