| Canada, n = 3795 | USA, n = 4453 | Australia, n = 3457 | UK, n = 3745 | |
| Age (%, years): | ||||
| 18–24 | 15.5 | 14.6 | 16.8 | 9.1 |
| 25–39 | 32.3 | 29.8 | 37.1 | 33.6 |
| 40–54 | 35.4 | 35.2 | 32.3 | 33.9 |
| 55+ | 16.8 | 20.5 | 13.7 | 23.4 |
| Sex, male (%) | 45.6 | 43.9 | 47.3 | 43.9 |
| Education (%): | ||||
| Low | 46.9 | 44.6 | 65.6 | 62.9 |
| Medium | 39.1 | 40.6 | 20.5 | 24.2 |
| High | 13.9 | 14.8 | 13.9 | 12.8 |
| Identified minority group (%) | 11.3 | 22.2 | 13.3 | 4.9 |
| Cigarettes per day (%) | ||||
| 1–10 | 31.8 | 32.7 | 31.5 | 30.0 |
| 11–20 | 42.6 | 45.1 | 39.3 | 53.7 |
| 21–30 | 21.3 | 13.1 | 22.1 | 11.5 |
| 31+ | 4.3 | 9.0 | 7.1 | 4.8 |
| Cohort (n): | ||||
| Wave 1 | 2214 | 2138 | 2305 | 2401 |
| Wave 2 | 517 | 684 | 258 | 255 |
| Wave 3 | 545 | 889 | 532 | 586 |
| Wave 4 | 519 | 742 | 362 | 503 |
Percentages are based on unweighted data.