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Strong Health-Risk Association The link between smoking and serious health consequences is now universally understood

The heaviest smokers are more likely to describe secondhand smoke as "somewhat harmful." Nearly four in 10 heavy smokers do not perceive secondhand smoke as being overly harmful

doi: 10.1016/j.taap.2016.10.008 185

Early in the epidemic, the CDC took e-cigarette samples to identify what EVALI patients were breathing into their respiratory systems

Even after adjusting for nonresponse, low response rates can increase the potential for bias if there are systematic differences between respondents and nonrespondents