Prevalence of cigarette smoking in midlife examinations, presented by birth cohort
| Born in 1908 | Born in 1914 | Born in 1918 | Born in 1922 | Born in 1930 | |
| Current smoking, 1968–1969, n (%) | 0 (0) | 2 (10.5) | 16 (20.0) | 38 (36.2) | 63 (38.7) |
| Currant smoking, 1974–1975, n (%) | 0 (0) | 2 (10.5) | 14 (18.2) | 28 (26.9) | 60 (37.7) |
| Current smoking, 1980–1981, n (%) | 0 (0) | 2 (10.5) | 11 (14.9) | 23 (22.8) | 52 (33.3) |