| Value | Category | 
                                    
                    
                        | 1 | Yes, everyday | 
                                    
                    
                        | 2 | Somethimes | 
                                    
                    
                        | 3 | Don't smoke | 
                                    
                    
                        | 97 | No answer | 
                                    
                    
                        | 98 |  | 
                                    
                    
                        | 9999998 | REFUSAL | 
                                    
                    
                        | 9999999 | DONTKNOW | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.