(See: Borderud SP, Li Y, Burkhalter JE, Sheffer CE, Ostroff JS. Electronic cigarette use among cancer patients: Characteristics of e-cigarette users and their smoking cessation outcomes. Cancer. Published online ahead of print on September 22, 2014. doi: 10.1002/cncr.28810.)

The Rest of the Story

To illustrate this, let's consider the five studies which the authors cite as providing evidence that electronic cigarettes inhibit smoking cessation.

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.

Why is the CDC unable to tell the truth? Why can't the agency even issue a statement that is internally consistent on this issue? Why is the CDC ignoring the wealth of evidence that it admits exists, which shows that many ex-smokers have used electronic cigarettes effectively as a smoking cessation aid?

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