"Smoking is no more hazardous than taking an exam in terms of its acute respiratory effects."

Thus, the authors readily acknowledge that it is impossible from this study to determine whether or not e-cigarettes lead to smoking or whether smoking leads to e-cigarette experimentation.

This study provides data to support the hypothesis that among smokers who choose to quit using e-cigarettes or over-the-counter nicotine replacement products (and without behavioral support), the e-cigarettes produce about a two-fold increase in the quit rate.

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