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.

Instead, these were all population-based studies of smoking and e-cigarette use that did not even ask smokers using e-cigarettes if they were using them regularly or if they were using them in an effort to quit smoking. Actually, one of the studies did ask smokers if they were using e-cigarettes to quit smoking and the overwhelming majority said that they were not. In other words, many of the smokers in this study were probably just experimenting with, or trying an e-cigarette, and were not regular users of these products.

In other words, while the policy allows Facebook to collect and use user information for research purposes, it does not allow Facebook to conduct interventions in which it manipulates feeds shared with users in order to try to control their emotions as part of a research experiment.

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