Distribution of cohort by quitting status at each of three waves
| Quitting status | W1 | W2 | W3 | W1 to W3 sample, n (%) | W2 to W4 sample, n (%) |
| Continuing smokers | Smoking | Smoking and no quit attempt since previous wave | Smoking and no quit attempt since previous wave | 2730 (90.8) | 2186 (87.7) |
| Successful quitters | Smoking | Quit at time of survey for at least 30 days | Remained quit from time of previous wave | 170 (5.7) | 221 (8.9) |
| Failed quitters | Smoking | Quit at time of survey for at least 30 days | Relapsed back to smoking at time of survey | 105 (3.5) | 86 (3.4) |
| Total | 3005 | 2493 |