| Value | Category |
|---|---|
| 1 | I have never smoked |
| 2 | I have never smoked everyday |
| 3 | 1 to 5 cigarettes per day |
| 4 | 6 to 15 cigarettes (about 1/2 pack) per day |
| 5 | 16 to 25 cigarettes (about 1 pack) per day |
| 6 | 26 to 35 cigarettes (about 1 1/2 pack) per day |
| 7 | 36 cigarettes or more (about 2 packs or more) per day |
| Sysmiss |