| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Sometimes (between 10% and 50% of cigarettes I smoked were shared with others) | 20 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    
| 2 | 2. Often (more than 50% of cigarettes I smoked were shared with others) | 21 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    
| 3 | 3. Rarely (less than 10% of cigarettes I smoked were shared with others) | 34 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    
| 4 | 4. Never | 272 | 
                                                                 
                                    
                                    78.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 652 |