With hundreds of electronic cigarettes out there, I hear outlandish claims all the time and most of them have been nothing more than just sales pitches.

Remember that I did not argue that a smoker switching from a non-filtered to a filtered cigarette kanger will reduce her cancer risk. It may be that vigorous compensation offsets the impact of such a change. However, I do believe that the scientific evidence supports the contention that all else being equal, a lifelong smoker of non-filtered cigarettes faces a slightly higher cancer risk than a lifelong smoker of filtered cigarettes.

One of my first assignments at the Office on Smoking and Health at CDC was to evaluate the evidence regarding the relationship between changes in tar yield of cigarettes and the risk of lung cancer. I examined the literature regarding both the introduction of the filter and other design changes that subsequently led to very low tar yields. My conclusion was that the filter itself produced a massive decline in tar yields, so great that even with smoker compensation, the lung cancer risk declined. However, further declines in tar yields were apparently not sufficient to overcome compensation, and lung cancer risks did not decline any further. Thus, my conclusion was that the filter produced small but measurable declines in lung cancer risk, but low-tar cigarettes within the filtered cigarette category conveyed no decrease in lung cancer risk.

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