| Value | Category |
|---|---|
| 1 | I have never smoked cigarettes |
| 2 | Yes, from a medical professional (e.g. doctor and nurse) |
| 3 | Yes, from my teachers |
| 4 | Yes, from a friend |
| 5 | Yes, from a family member |
| 6 | Yes, from medical professionals (doctor an nurse), from teachers, from friends or family members |
| 7 | No |
| Sysmiss |