• 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.

(See: Grana R, Benowitz N, Glantz SA. E-Cigarettes: A Scientific Review. Circulation 2014; 129: 1972-1986.)

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