All-cause and cause-specific mortality risk by number of cigarettes smoked per day
among current smokersa (A) All-cause mortality, (B) Smoking-related cancer
mortality, and (C) Circulatory disease mortality aHazard ratios and 95%
confidence intervals were adjusted for age, alcohol intake (men: never, former, <1
time/week, regularly <23, 23 to <46, ≥46 g/d; women: never, former, <1
time/week, regularly <23, ≥23 g/d) and region (for the Japan Public Health
Center-based Prospective Study, Cohort I, the Japan Public Health Center-based
Prospective Study, Cohort II, the Japan Collaborative Cohort Study and the Life Span
Study).