• The only study to examine this question found that e-cigarettes are not a gateway to smoking.
The degree to which electronic cigarettes stimulate or depress overall interest in quitting is a separate and empirically answerable question. In fact, evidence from the UK indicates that the spread of electronic cigarettes has been associated with a in the desire to quit smoking at a population level.
Suppose that there are 1000 e-cigarette users who enter the cancer center with a diagnosis of cancer. Of these, an amazing 900 were able to quit smoking. However, 100 were very resistant smokers and could not quit smoking, even with e-cigarettes. Note that it would be these 100 resistant smokers who would be enrolled in the study. The 900 ex-smokers who quit using e-cigarettes would not be eligible for the study, because they no longer smoke.
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