| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 2696 | 
                                    
                                    82.1%
                                 | 
| 2 | I did not smoke during the past 12 months | 226 | 
                                    
                                    6.9%
                                 | 
| 3 | Yes | 77 | 
                                    
                                    2.3%
                                 | 
| 4 | No | 286 | 
                                    
                                    8.7%
                                 | 
| Sysmiss | 28 |