1. The subjects did not consent to participate in the study.

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.

The study finds that e-cigarette use is associated with smoking status. In addition, e-cigarette use is associated with heavier smoking and with fewer periods of smoking abstinence.

Unfortunately, it's just not that simple.

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