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In addition, a cross-sectional study by Koopmans and colleagues (1997) found that adolescent and young adult smokers were more likely to drink than were their nonsmoking counterparts, and this relationship appeared to be mediated more by shared environmental factors than by genetic factors

The multivariate relative risk of total coronary heart disease among current smokers compared with participants who never smoked was 4.23 (95% confidence interval, 3.60 to 4.96)

Why is COPD more common in rural areas

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