Assertion: tobacco's risk | /r/CapableOf | persist in other words
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text: In other words, the risk attributable to smoking persisted even when adjustments were made for differences between persons who smoke and nonsmokers in levels of these other risk factors (Friedman et al. 1979; USDHHS 1983, 2001, 2004; Shaper et al. 1985; Criqui et al. 1987; Ragland and Brand 1988; Shaten et al.