| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 15476 |
78.8%
|
| 2 | I do not smoke at present | 2073 |
10.6%
|
| 3 | Yes | 1616 |
8.2%
|
| 4 | No | 465 |
2.4%
|
| Sysmiss | 244 |