Characteristics of the adolescent sample
| Characteristic | Number (%) |
| Grade | |
| 6 | 30 (4.8) |
| 7 | 72 (11.4) |
| 8 | 70 (11.1) |
| 9 | 122 (19.3) |
| 10 | 128 (20.3) |
| 11 | 106 (16.8) |
| 12 | 104 (16.5) |
| Sex | |
| Female | 367 (58.1) |
| Male | 265 (41.9) |
| Family and friend smoking | |
| None | 77 (12.2) |
| Family only | 40 (6.3) |
| Friends only | 185 (29.3) |
| Both | 330 (52.2) |
| Smoking status1-150 | |
| Non-susceptible/never smoker | 236 (37.3) |
| Susceptible/never smoker | 47 (7.4) |
| Non-current/experimenter | 165 (26.1) |
| Current/experimenter | 55 (8.7) |
| Smoker | 129 (20.4) |
↵1-150 A respondent is susceptible to smoking if unable to answer “definitely not” to the following questions: “Do you think you will try a cigarette in the next 6 months?” and “Would you smoke a cigarette if your friend offered you one?”. Experimental smokers have smoked 1–99 cigarettes in their lifetime, and smokers have smoked ⩾ 100 cigarettes in their lifetime. Current smoking is smoking within the past 30 days.