| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 2159 |
68.3%
|
| 2 | 0 times | 396 |
12.5%
|
| 3 | 1 to 3 times | 447 |
14.1%
|
| 4 | 4 or more times | 159 |
5%
|
| Sysmiss | 53 |