While Dr. Glantz's statement that few people have switched away from cigarettes or used e-cigarettes as a bridge to eventually go off cigarettes was not science-based, but pure speculation, there are now two studies which actually examine the trajectory of electronic cigarette and conventional cigarette use among a cohort of e-cigarette users. We are able to empirically examine Glantz's dual use argument and his claim that very few smokers are using e-cigarettes as a bridge to eventually go off cigarettes.

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