| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never smoked cigarettes | 3105 | 
                                    
                                    83.2%
                                 | 
| 2 | I have not stopped smoking | 141 | 
                                    
                                    3.8%
                                 | 
| 3 | 1-3 months | 159 | 
                                    
                                    4.3%
                                 | 
| 4 | 4-11 months | 73 | 
                                    
                                    2%
                                 | 
| 5 | One year | 68 | 
                                    
                                    1.8%
                                 | 
| 6 | 2 years | 62 | 
                                    
                                    1.7%
                                 | 
| 7 | 3 years or longer | 122 | 
                                    
                                    3.3%
                                 | 
| Sysmiss | 37 |