Willpower | 1 | Age | 1.006 | 0.984 to 1.028 |
| | Sex | 0.724 | 0.421 to 1.244 |
| | Time to first cigarette | 1.270 | 0.982 to 1.642 |
| | Considering quitting | 1.355 | 0.784 to 2.341 |
| | Educational qualifications | 1.890 | 0.985 to 3.627 |
| 2 | Test result | 0.302** | 0.142 to 0.644 |
| | Information provision | 0.750 | 0.349 to 1.611 |
| 3 | Test result × information provision | 1.175 | 0.400 to 3.452 |
Bupropion | 1 | Age | 0.958** | 0.934 to 0.983 |
| | Sex | 1.185 | 0.656 to 2.142 |
| | Time to first cigarette | 0.753 | 0.566 to 1.002 |
| | Considering quitting | 0.893 | 0.493 to 1.618 |
| | Educational qualifications | 0.679 | 0.325 to 1.420 |
| 2 | Test result | 4.717*** | 2.043 to 10.891 |
| | Information provision | 1.279 | 0.526 to 3.111 |
| 3 | Test result × information provision | 1.382 | 0.423 to 4.510 |