Sample characteristics by country (weighted data)
| Variables | USA n = 1934 | Canada n = 2000 | UK n = 2205 | Australia n = 2066 |
|---|---|---|---|---|
| HSI, heavy smoking index. | ||||
| % female | 46.5 | 45.9 | 49.3 | 44.8 |
| Age | ||||
| 18–24 | 14.9 | 13.8 | 13.9 | 16.8 |
| 25–39 | 30.4 | 32.6 | 32.6 | 34.9 |
| 40–54 | 36.8 | 35.6 | 28.9 | 32.8 |
| 55+ | 17.9 | 18.0 | 24.6 | 15.4 |
| Education | ||||
| Low | 12.6 | 17.2 | 39.8 | 43.9 |
| Medium | 33.5 | 31.8 | 25.1 | 25.3 |
| High | 53.8 | 50.9 | 35.2 | 30.7 |
| Income | ||||
| Low | 35.7 | 27.6 | 28.4 | 26.3 |
| Medium | 35.2 | 36.7 | 34.3 | 34.7 |
| High | 21.3 | 27.0 | 27.5 | 33.1 |
| No information | 7.7 | 8.7 | 9.8 | 5.9 |
| Mean HIS | 3.0 | 2.9 | 2.7 | 3.0 |
| % with low self-efficacy to quit | 27.5 | 19.3 | 39.4 | 28.8 |
| % with no intention to quit | 25.6 | 18.5 | 35.3 | 25.0 |