Smoking status and second-hand smoke (SHS) exposure in firefighters compared with the control group
| Firefighters | SAPALDIA | p-value | |
| Subjects n | 101 | 735 | |
| Current smoker | 32 (32) | 294 (40) | 0.128 |
| Cigarettes·day−1 | 5±11 | 7±12 | 0.044 |
| Never-smoker | 44 (44) | 241 (33) | 0.034 |
| SHS in never-smokers | 25 (57) | 67 (28) | <0.001 |
| Former smoker | 23 (23) | 197 (27) | 0.470 |
| SHS in former smokers | 8 (35) | 50 (25) | 0.327 |
Data are presented as n (%) or mean±sd, unless otherwise stated. SAPALDIA: Swiss Study on Air Pollution and Lung Diseases in Adults.