| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 700 |
68.2%
|
| 2 | Less than 1 week | 52 |
5.1%
|
| 3 | 1 week to 15 days | 34 |
3.3%
|
| 4 | 16 days to 1 month | 25 |
2.4%
|
| 5 | 2 to 3 months | 27 |
2.6%
|
| 6 | 4 to 6 months | 24 |
2.3%
|
| 7 | 6 months to 1 year | 31 |
3%
|
| 8 | More than 1 year | 134 |
13%
|
| Sysmiss | 21 |