| Cannabis only(N = 75) | Cannabis + tobacco(N = 91) | Tobacco only(N = 92) | Non-smoker(N = 81) | |
| Mean (SD) age (years) | 42.5 (9.7) | 41.3 (9.2) | 46.0 (10.0) | 43.7 (10.3) |
| Men, N (%) | 67 (89.3) | 62 (68.1) | 77 (83.7) | 65 (80.3) |
| Mean (SD) height (m) | 1.75 (0.07) | 1.73 (0.08) | 1.74 (0.09) | 1.75 (0.09) |
| Caucasian, N (%) | 68 (90.7) | 74 (82.2) | 88 (95.7) | 75 (92.6) |
| Mean (SD) joint-years | 54.2 (75.3) | 46.0 (44.0) | – | – |
| Mean (SD) pack-years | – | 16.1 (11.5) | 23.5 (15.8) | – |
| Median (interquartile range) deprivation score (10 = most deprived) | 5 (2–8) | 4 (3–7) | 3 (1–5) | 2 (1–5) |