| Value | Category | Cases | |
|---|---|---|---|
| 1 | More comfortable | 779 | 
                                    
                                    21%
                                 | 
| 2 | Less comfortable | 1801 | 
                                    
                                    48.6%
                                 | 
| 3 | No difference from non-smokers | 1123 | 
                                    
                                    30.3%
                                 | 
| Sysmiss | 64 |