| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 3443 |
56.7%
|
| 2 | 0 times | 1554 |
25.6%
|
| 3 | 1 to 3 times | 645 |
10.6%
|
| 4 | 4 or more times | 433 |
7.1%
|
| Sysmiss | 156 |