| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked | 2960 | 
                                    
                                    90%
                                 | 
| 2 | I did not smoke during the past 12 months | 182 | 
                                    
                                    5.5%
                                 | 
| 3 | Yes | 34 | 
                                    
                                    1%
                                 | 
| 4 | No | 114 | 
                                    
                                    3.5%
                                 | 
| Sysmiss | 23 |