Harris et al., in perhaps the most comprehensive and definitive on this issue, found a clear increase in cancer risk associated with non-filtered cigarettes. As they reported: "Compared with smokers of medium tar (15-21 mg) filter cigarettes, risk was higher among men and women who smoked high tar (> or = 22 mg) non-filter brands (hazard ratio 1.44, 95% confidence interval 1.20 to 1.73, and 1.64, 1.26 to 2.15, respectively)."

The rest of the story is that in a tragic reversal of the historical functions of public health viz a viz industry, it is now the e-cigarette companies that are attempting to undermine cigarette smoking while the health groups, led by CDC and FDA, are protecting the cigarette market by undermining the anti-smoking messages from the e-cigarette industry.

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