The introduction and proliferation of filtered cigarettes occurred mostly in the decades preceding and following the 1964 Surgeon General's report and was mostly complete by 1974. Further reductions in tar yield occurred through other mechanisms, as by 1974, most cigarette brands were filtered.

According to the press release: "Do not smoke and do not allow yourself to be exposed to smoke because second-hand smoke and third-hand smoke are just as deadly as first-hand smoke, says a scientist at the University of California, Riverside who, along with colleagues, conducted the first animal study of the effects of third-hand smoke."

Trueba et al. also found that higher depressive mood was associated with greater reductions in exhaled nitric oxide.

• We lied to you when we told you that "No studies have been done to examine the safety of e-cigarettes."

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