While the attacks were mostly personal, and not worthy of expounding here, the shred of substance was that more recent studies which compared lung cancer risks of successive cohorts of smokers have found increased risk among more recent cohorts. From these studies, the Surgeon General's report - and these co-authors - conclude that filters must convey an increased risk of cancer.

The authors acknowledge this: "We must state though that while the differences within our study are of statistical significance, the clinical changes may be too small to be of major clinical importance."

The Marini study demonstrates that electronic cigarettes do lead to a reduction in exhaled nitric oxide, which suggests that they have a mild respiratory irritant effect and induce some inflammation in the airways. This is a finding which has been reported previously in a number of studies. It is not surprising because propylene glycol is known to be a mild respiratory irritant.

The bottom line: it appears that the use of electronic cigarettes has tremendous health benefits not only for those who quit smoking, but also for those who become dual users. While it may take longer for these individuals to eventually get off of nicotine altogether, it appears that the switch to e-cigarettes yields a much lower level of nicotine addiction, making it easier, not harder, to subsequently cease using nicotine if they so desire.

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