| Type of workplace exposure | % ever exposed | OR (crude) | OR (adjusted) |
| HMW | 21.1 | 1.02 (0.80 to 1.30) | 0.95 (0.74 to 1.21) |
| LMW | 24.2 | 0.99 (0.79 to 1.25) | 1.12 (0.89 to 1.43) |
| Mixed environments | 10.4 | 0.81 (0.57 to 1.15) | 0.90 (0.63 to 1.28) |
| Any high risk | 37.7 | 1.06 (0.87 to 1.30) | 1.09 (0.88 to 1.33) |
| Peak irritant | 4.1 | 0.53 (0.27 to 1.04) | 0.77 (0.39 to 1.53) |
| ETS | 11.7 | 1.59 (1.23 to 2.07) | 1.44 (1.10 to 1.88) |
ETS, environmental tobacco smoke; HMW, high molecular weight; LMW, low molecular weight.