| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 3 |
37.5%
|
| 2 | Less than 1 cigarette per day | 1 |
12.5%
|
| 3 | 1-5 cigarettes per day | 2 |
25%
|
| 4 | 6-10 cigarettes per day | 0 |
0%
|
| 5 | 10-20 cigarettes per day | 1 |
12.5%
|
| 6 | 21-30 cigarettes per day | 1 |
12.5%
|
| 7 | More than 30 cigarettes per day | 0 |
0%
|
| Sysmiss | 3184 |