| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 1746 |
69.8%
|
| 2 | Less than 1 week | 154 |
6.2%
|
| 3 | 1 week to 15 days | 89 |
3.6%
|
| 4 | 16 days to 1 month | 63 |
2.5%
|
| 5 | 2 to 3 months | 81 |
3.2%
|
| 6 | 4 to 6 months | 57 |
2.3%
|
| 7 | 6 months to 1 year | 63 |
2.5%
|
| 8 | More than 1 year | 248 |
9.9%
|
| Sysmiss | 39 |