| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 7161 |
62.7%
|
| 2 | Less than 1 week | 753 |
6.6%
|
| 3 | 1 week to 15 days | 441 |
3.9%
|
| 4 | 16 days to 1 month | 398 |
3.5%
|
| 5 | 2 to 3 months | 403 |
3.5%
|
| 6 | 4 to 6 months | 357 |
3.1%
|
| 7 | 6 months to 1 year | 458 |
4%
|
| 8 | More than 1 year | 1443 |
12.6%
|
| Sysmiss | 171 |