Table 2 –
Distribution of cases of oral and pharyngeal cancer, laryngeal cancer, and controls according to selected aspects of cigarette smoking habits. INHANCE consortium
| Controls | (%) | Oral and pharyngeal cancer cases | (%) | Laryngeal cancer cases | (%) | |
|---|---|---|---|---|---|---|
| Cigarette smoking status | ||||||
| Never user | 13,347 | (45) | 2,791 | (21) | 330 | (7) |
| Former user | 8,792 | (29) | 2,909 | (22) | 1,353 | (27) |
| Current user | 7,705 | (26) | 7,617 | (57) | 3,260 | (66) |
| Cigarette smoking intensity (number of cigarettes/day) | ||||||
| Never user | 13,347 | (45) | 2,791 | (21) | 330 | (7) |
| ≥1–15 | 7,199 | (24) | 2,814 | (21) | 1,054 | (21) |
| >15–25 | 6,166 | (21) | 4,483 | (34) | 2,083 | (42) |
| >26–40 | 3,132 | (10) | 3,229 | (24) | 1,476 | (30) |
| Cigarette smoking duration (years) | ||||||
| Never user | 13,347 | (45) | 2,791 | (21) | 330 | (7) |
| ≥1–25 | 7,214 | (24) | 2,019 | (15) | 604 | (12) |
| >25–35 | 4,360 | (15) | 3,370 | (25) | 1,330 | (27) |
| >35–51 | 4,923 | (16) | 5,137 | (39) | 2,679 | (54) |
| Time since quitting cigarette smoking (years) (for formers only)a | ||||||
| ≥1-<10 | 2,300 | (26) | 1,310 | (45) | 626 | (46) |
| ≥10 | 3,655 | (72) | 1,522 | (52) | 711 | (53) |
| Missing | 137 | (2) | 77 | (3) | 16 | (1) |
a
Proportions were calculated among former smokers only.