| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 90289 |
74.5%
|
| 2 | I did not smoke during the past 12 months | 11846 |
9.8%
|
| 3 | Yes | 11325 |
9.4%
|
| 4 | No | 7660 |
6.3%
|
| Sysmiss | 920 |