| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 1224 |
60.6%
|
| 2 | Less than 1 week | 115 |
5.7%
|
| 3 | 1 week to 15 days | 58 |
2.9%
|
| 4 | 16 days to 1 month | 72 |
3.6%
|
| 5 | 2 to 3 months | 82 |
4.1%
|
| 6 | 4 to 6 months | 69 |
3.4%
|
| 7 | 6 months to 1 year | 103 |
5.1%
|
| 8 | More than 1 year | 298 |
14.7%
|
| Sysmiss | 30 |