| Value | Category |
|---|---|
| 1 | I have never smoked tobacco products |
| 2 | I don’t smoke tobacco products anymore |
| 3 | I smoke, but I never take any other psychoactive substances |
| 4 | No, I smoke less, while I take such substances |
| 5 | Yes, I smoke more often when I take such substances |
| 6 | I smoke more or less the same, when I take and don’t take such substances |
| Sysmiss |