| Value | Category | Cases | |
|---|---|---|---|
| 1 | Non smoker | 2315 |
91.3%
|
| 2 | An occasional smoker | 167 |
6.6%
|
| 3 | An accustomed smoker | 21 |
0.8%
|
| 4 | A daily smoker | 32 |
1.3%
|
| Sysmiss | 12 |