Quit ratios (%) (95% CI) additionally adjusted for smokeless tobacco use by age and sex in the USA and Canada in 2006–2007
| Age group (years) | All ages | |||||||
| 16–19 | 20–29 | 30–39 | 40–49 | 50–59 | 60–69 | 70+ | ||
| USA | ||||||||
| Men | 12.1 (8.6 to 15.6) | 24.2 (22.6 to 25.8) | 31.8 (30.3 to 33.3) | 37.9 (36.5 to 39.3) | 50 (48.6 to 51.4) | 67.2 (65.8 to 68.6) | 82.3 (81.1 to 83.5) | 46.6 (46 to 47.2) |
| 6.1 (3.5 to 8.7) | 17.6 (16.1 to 19.1) | 27.1 (25.7 to 28.5) | 34.9 (33.5 to 36.3) | 47.1 (45.8 to 48.4) | 65.1 (63.6 to 66.6) | 81.1 (79.8 to 82.4) | 43.1 (42.5 to 43.7) | |
| Women | 13.9 (10.1 to 17.7) | 30.6 (29 to 32.2) | 40.6 (38.9 to 42.3) | 43.1 (41.7 to 44.5) | 56.1 (54.8 to 57.4) | 66.2 (64.7 to 67.7) | 82.3 (80.9 to 83.7) | 50.6 (49.9 to 51.3) |
| 5.3 (2.9 to 7.7) | 22.5 (21 to 24) | 34.9 (33.4 to 36.4) | 39.4 (38 to 40.8) | 53.3 (52 to 54.6) | 63.2 (61.7 to 64.7) | 80.5 (79.1 to 81.9) | 46.3 (45.7 to 46.9) | |
| Canada | ||||||||
| Men | 11.4 (7.9 to 14.9) | 24.9 (22.5 to 27.3) | 49 (44 to 54) | 51 (46.7 to 55.3) | 62.1 (58.6 to 65.6) | 78.1 (73 to 83.2) | 87.4 (84.1 to 90.7) | 56.7 (54.8 to 58.6) |
| 6 (3.4 to 8.6) | 19.5 (17.3 to 21.7) | 43.9 (39 to 48.8) | 48.5 (44.4 to 52.6) | 59 (54 to 64) | 76.4 (71.5 to 81.3) | 87.1 (83.9 to 90.3) | 53.6 (51.7 to 55.5) | |
| Women | 9.9 (6.4 to 13.4) | 37.4 (34.2 to 40.6) | 51.4 (46.2 to 56.6) | 57.8 (52.9 to 62.7) | 61 (57.1 to 64.9) | 76.5 (70.5 to 82.7) | 76.7 (70.7 to 82.7) | 57.4 (55.1 to 59.7) |
| 4.3 (1.9 to 6.7) | 27.2 (24.7 to 29.7) | 46.8 (42 to 51.6) | 54.5 (49.9 to 59.1) | 57.5 (52.7 to 62.3) | 71.8 (66.2 to 77.4) | 75.7 (69.8 to 81.6) | 52.9 (50.8 to 55) | |
Percentages in bold give quit ratios when those who report quitting cigarettes within the previous year are reclassified as continuing smokers.