Wave 1 study group/subgroup | n | Wave 2 product use state | |||
---|---|---|---|---|---|
Exclusive cigarette smoking % (CI) | Dual use % (CI) | Exclusive e-cigarette use % (CI) | Neither % (CI) | ||
1. Exclusive cigarette smoker | 8613 | 76.4 (75.3, 77.4) | 4.3 (3.8, 4.9) | 1.3 (1.1, 1.6) | 18.0 (17.0, 19.0) |
1.1. Experimental cigarette smoker | 1396 | 36.7 (34.1, 39.3) | 1.3 (0.8, 2.1) | 1.8 (1.2, 2.9) | 60.2 (57.5, 62.8) |
1.2. Established cigarette smoker without a history of e-cigarette use | 6887 | 84.4 (83.3, 85.4) | 4.1 (3.6, 4.7) | 1.1 (0.9, 1.4) | 10.4 (9.5, 11.4) |
1.3. Established cigarette smoker with a history of e-cigarette use | 330 | 66.4 (60.9, 71.5) | 23.1 (18.4, 28.6) | 3.7 (2.1, 6.3) | 6.8 (4.1, 11.0) |
2. Exclusive e-cigarette user | 580 | 12.0 (9.4, 15.4) | 10.4 (7.9, 13.5) | 45.0 (40.8, 49.3) | 32.6 (28.2, 37.2) |
2.1. Experimental e-cigarette user without a history of cigarette smoking | 120 | 7.51 (3.9, 13.9) | - 2 | 10.61 (5.7, 18.7) | 80.6 (71.7, 87.2) |
2.2. Experimental e-cigarette user with a history of cigarette smoking | 94 | 30.0 (21.1, 40.7) | - 2 | 14.4 (8.1, 24.3) | 51.8 (41.0, 62.4) |
2.3 Established e-cigarette user without a history of cigarette smoking | 77 | 8.21 (3.8, 16.6) | - 2 | 62.2 (49.8, 73.2) | 25.9 (15.6, 39.7) |
2.4 Established e-cigarette user with a history of cigarette smoking | 289 | 8.5 (5.8, 12.5) | 16.8 (12.7, 21.9) | 62.4 (56.7, 67.8) | 12.3 (8.3, 17.7) |
3. Dual user | 2132 | 54.9 (52.1, 57.6) | 28.0 (25.7, 30.3) | 6.0 (4.8, 7.5) | 11.1 (9.7, 12.7) |
3.1 Experimental dual user | 1340 | 67.2 (64.1, 70.2) | 13.4 (11.6, 15.5) | 5.1 (3.8, 6.8) | 14.3 (12.3, 16.7) |
3.2 Established dual user | 792 | 34.3 (30.2, 38.6) | 52.3 (48.0, 56.6) | 7.6 (5.9, 9.9) | 5.8 (4.3, 7.8) |