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Cause−specific mortality at ages 35−89 years for daily vs never smoking. COPD = chronic obstructive pulmonary disease. RR = mortality rate ratio. Analyses exclude those with previous disease at recruitment and are adjusted for age at risk, sex, district, highest education attained and alcohol consumption. The area of each plotting symbol is proportional to the amount of statistical information, and the lines through them represent group-specific 95% confidence intervals
