How do we know this? Because the authors tell us!

As a result, the report implies that cigarette filters increase lung cancer risk and opens the way for lawsuits based on this claim, as the Law360.com article suggests.

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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