It is easy to see how this fatal flaw in the research destroys the validity of the authors' conclusion.

One might argue that this is just one errant professor. However, as it acknowledges on its :

In fact, many vapers have reported that after switching to electronic cigarettes, they have lost the desire to return to smoking because the taste of tobacco cigarettes is no longer pleasant after having experiencing the flavors of electronic cigarettes. It is possible, then, that electronic cigarettes do not serve as a gateway to tobacco smoking but instead, serve as a sort of barrier to tobacco smoking.

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