Incidentally, it is just not true that the plural of anecdote is not data. In fact, a single anecdote is "data." One of the most basic study designs in epidemiology is something called a "case study." That is the "anecdote" about a single individual. The next basic design is a "case series," which is simply a number of "anecdotes."

It is so frustrating to me to wake up every day to find another anti-smoking group spreading fraudulent statements about the health effects of cigarettes. This truly undermines decades of public education about the dangers of smoking. And it helps protect the profits of cigarette companies at the expense of the protection of the public's health.

Despite the tremendous proliferation of e-cigarette experimentation among youth, with a doubling of use from 2011 to 2012 alone, the CDC data show that youth smoking prevalence (among high school students) fell dramatically, from 18.1% in 2011 to 15.7% in 2013. This is a 13.3% decline in smoking prevalence over a two-year period. It is also the largest drop in youth smoking prevalence measured by this survey over the past decade.

Suppose that there are 1000 e-cigarette users who enter the cancer center with a diagnosis of cancer. Of these, an amazing 900 were able to quit smoking. However, 100 were very resistant smokers and could not quit smoking, even with e-cigarettes. Note that it would be these 100 resistant smokers who would be enrolled in the study. The 900 ex-smokers who quit using e-cigarettes would not be eligible for the study, because they no longer smoke.

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