A recent from the UK involved a survey of 12,171 adults in February and March of this year. The survey found that 4.7% of ex-smokers were regularly using electronic cigarettes. Among these ex-smokers, 71% reported that they were using e-cigarettes to try to quit smoking and 48% reported that they were using e-cigarettes to try to keep off tobacco products. These data suggest that the overwhelming majority of ex-smokers using e-cigarettes are people who smoked and then quit smoking because of these products, rather than ex-smokers who returned to nicotine use via e-cigarettes.

This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

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