Disclosure: I have not received any funding or compensation from the tobacco, electronic cigarette, or pharmaceutical industries. However, I am seeking funding from several electronic cigarette companies to conduct a behavioral study on the effects of electronic cigarettes on smoking behavior.

• The truth is that the study we relied upon did not measure the time course of electronic cigarette and cigarette use. Thus, it could not determine whether the kids who were using both cigarettes and electronic cigarettes had initiated with smoking or with electronic cigarettes.

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