Model | Wave 1 subgroup | Wave 2 product use state | |||
---|---|---|---|---|---|
Exclusive cigarette smoking aOR (95% CI) | Dual use aOR (95% CI) | Exclusive e-cigarette use aOR (95% CI) | Neither aOR (95% CI) | ||
Model A1. Exclusive cigarette smoker group (n = 8613) | 1.2. Established cigarette smoker without a history of e-cigarette use | 4.04‡ (2.19, 7.45) | 4.34‡ (1.87, 10.10) | 1 [Reference] | 0.52† (0.28, 0.97) |
1.3. Established cigarette smoker with a history of e-cigarette use | 1.60 (0.68, 3.74) | 9.73‡ (3.39, 27.92) | 1 [Reference] | 0.14‡ (0.05, 0.39) | |
Model B2. Exclusive e-cigarette user group (n = 580) | 2.2. Experimental e-cigarette user with a history of cigarette smoking | 5.36 (0.82, 35.14) | 2.63 (0.22, 31.62) | 1 [Reference] | 0.55 (0.16, 1.87) |
2.3. Established e-cigarette user without a history of cigarette smoking | 0.13† (0.02, 0.87) | 0.53 (0.05, 6.25) | 1 [Reference] | 0.05‡ (0.02, 0.17) | |
2.4. Established e-cigarette user with a history of cigarette smoking | 0.27 (0.07, 1.06) | 2.03 (0.30, 13.84) | 1 [Reference] | 0.02‡ (0.01, 0.06) | |
Model C3. Dual user group (n = 2132) | 3.2. Established dual user | 0.30‡ (0.20, 0.46) | 2.43‡ (1.59, 3.73) | 1 [Reference] | 0.31‡ (0.19, 0.51) |