Today, I reflect on what this story demonstrates about the scientific bias that is apparent in the anti-smoking movement, particularly among researchers like Dr. Glantz, who has repeatedly misinterpreted scientific studies in order to skewer electronic cigarettes.

It is important to point out that just because the relative risk of cancer associated with filtered cigarettes is lower than that for non-filtered cigarettes, it does not necessarily follow that switching from a non-filtered to a filtered cigarette will reduce one's health risks. It is possible that smokers who make such a switch will compensate because they are used to higher tar levels. It is possible that the observed reduction in cancer risk only holds for lifelong filtered cigarette smokers, as they do not compensate (they never smoked non-filtered cigarettes). In fact, the scientific evidence supports this contention.

We apologize for any inconvenience caused by these small, technical errors in our reporting.

• 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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