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.

This is particularly disturbing, as five years have passed and numerous studies have been published since the FDA originally told the public that cigarette smoking may be than using non-tobacco, non-combusted electronic cigarettes.

As the authors point out: "Of interest, consistent improvements in subjective and objective asthma outcomes were also observed amongst dual users (i.e., heavy reducers) with no real difference in dual compared to single users by the end of the observation period."

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