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 purports to review the scientific evidence of the use of e-cigarettes as a smoking cessation aid and it concludes that population-based studies have demonstrated that e-cigarettes inhibit quitting. Specifically, the article concludes as follows: "e-cigarette use in the real world is associated with significantly lower odds of quitting smoking cigarettes."

Tony Gwynn's at age 54 from repeated smokeless tobacco use is the reason why. While it is not common, traditional smokeless tobacco use is clearly associated with oral cancer. In addition, there is little evidence that as marketed and used in the United States, these products are helping a substantial proportion of smokers to stay off cigarettes.

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