Sometimes, reality isn't what it seems. And once in a rare while, it is exactly the opposite. That is the case in today's Rest of the Story.

After blasting electronic cigarettes, the author writes:

"By improving symptoms of depression, smoking may actually enhance respiratory health."

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.

The article reports the results of a cross-sectional sample of adolescents interviewed in 2011 and 2012 in the National Youth Tobacco Survey. Youths were asked to report their smoking status as well as their e-cigarette use, both any use and current use (at least once in the past month).

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