Prevalence and cross-sectional association of baseline e-cigarette use and combustible tobacco use in combined sample of baseline ever smokers and never smokers
| Baseline ever use | Overall (n=2794) | Baseline e-cigarette never users (n=2191) | Baseline e-cigarette ever users (n=603) | Difference in prevalence rates | |
| % (95% CI) | P value | ||||
| Any combustible tobacco product, n (%) | 609 (21.8) | 197 (9.0) | 412 (68.3) | 59.3 (55.4 to 63.2) | <0.001* |
| Combustible cigarettes, n (%) | 496 (17.8) | 151 (6.9) | 345 (57.2) | 50.3 (46.2 to 54.4) | <0.001* |
| Cigars, n (%)† | 157 (5.6) | 28 (1.3) | 129 (21.4) | 20.1 (16.8 to 23.4) | <0.001* |
| Hookah, n (%)‡ | 339 (12.2) | 81 (3.7) | 258 (42.8) | 34.1 (30.0 to 38.2) | <0.001* |
| Number of different combustible tobacco products, n (%) | <0.001* | ||||
| 0 | 2185 (78.2) | 1994 (91.0) | 191 (31.7) | ||
| 1 | 324 (11.6) | 142 (6.5) | 182 (30.2) | ||
| 2 | 187 (6.7) | 47 (2.1) | 140 (23.2) | ||
| 3 | 98 (3.5) | 8 (0.4) | 90 (14.9) | ||
*χ2 test.
†Due to missing data for each respective variable, denominators are n=2793.
‡Due to missing data for each respective variable, denominators are n=2790.