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Cause-specific mortality at ages 30–69 years for cigarette smokers versus never-smokers by age when starting to smoke
Box area is inversely proportional to the variance of the log risk. Error bars denote group-specific 95% CIs. Analyses were adjusted for age, sex, education, alcohol consumption, body-mass index, and province. COPD=chronic obstructive pulmonary disease. IHD=ischaemic heart disease.
