| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 8257 |
99.5%
|
| 2 | I did not smoke during the past 12 months | 21 |
0.3%
|
| 3 | Yes | 3 |
0%
|
| 4 | No | 18 |
0.2%
|
| Sysmiss | 9 |