| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 962 |
58.8%
|
| 2 | Less than 1 week | 131 |
8%
|
| 3 | 1 week to 15 days | 70 |
4.3%
|
| 4 | 16 days to 1 month | 73 |
4.5%
|
| 5 | 2 to 3 months | 69 |
4.2%
|
| 6 | 4 to 6 months | 72 |
4.4%
|
| 7 | 6 months to 1 year | 68 |
4.2%
|
| 8 | More than 1 year | 192 |
11.7%
|
| Sysmiss | 34 |