The paper defends its ethical standards by arguing that it "was consistent with Facebook's Data Use Policy, to which all users agree prior to creating an account on Facebook, constituting informed consent for this research."

The Rest of the Story

One thing that is true is that there are no cardiovascular benefits to smoking reduction. The reason for this is that the adverse cardiovascular effects of smoking saturate at a low level of exposure. However, with carcinogenic effects as well as lung disease, there is a well-recognized dose-response relationship between exposure and disease risk. Therefore, substantial smoking reduction has no cardiovascular benefit but it does lower lung cancer risk and respiratory morbidity.

According to a Business Standard entitled "Third-Hand Smoke Just as Lethal as First-Hand Smoke": "A scientist at the University of California, Riverside suggests that second-hand smoke and third-hand smoke are just as deadly as first-hand smoke. While first-hand smoke refers to the smoke inhaled by a smoker and second-hand smoke to the exhaled smoke and other substances emanating from the burning cigarette that can get inhaled by others, third-hand smoke is the second-hand smoke that gets left on the surfaces of objects, ages over time and becomes progressively more toxic."

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