Figure 2.

Effect of daily vs never smoking on all−cause mortality at ages 35 − 89 years, by amount smoked. RR = mortality rate ratio. Analyses exclude those with previous disease at recruitment and are adjusted for age at risk, district, highest education attained and alcohol consumption. The area of each plotting symbol is proportional to the amount of statistical information. Vertical lines through the symbols represent group-specific 95% confidence intervals, with the number of deaths in each category shown at the bottom of each line. Estimates are plotted against the mean number of cigarettes smoked per day at resurvey among participants who continued to smoke. Among non-daily smokers, the RR compared with never smokers was 0.98 (95% CI 0.90-1.07)