| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 2958 | 
                                    
                                    35.9%
                                 | 
| 1 | yes, smokes nothing | 5277 | 
                                    
                                    64%
                                 | 
| 9 | 4 | 
                                    
                                    0%
                                 |