Prevalence of cigarette, e-cigarette and dual-use by respondent characteristics
| Factors | Cig. | 95% CI | E-cig. | 95% CI | Dual | 95% CI | N | % |
| Overall | 4.3 | 3.9 to 4.6 | 3.5 | 3.2 to 3.8 | 2.4 | 2.1 to 2.6 | 12 767 | 100 |
| Region | ||||||||
| North | 6.1 | 5.1 to 7.0 | 4.7 | 3.9 to 5.5 | 3.5 | 2.9 to 4.4 | 2472 | 19.4 |
| Northeast | 3.9 | 3.2 to 4.7 | 3.6 | 2.9 to 4.4 | 3.2 | 2.5 to 3.9 | 2475 | 19.4 |
| Central | 4.7 | 3.8 to 5.6 | 2.5 | 1.8 to 3.4 | 1.0 | 0.5 to 1.3 | 2295 | 18.0 |
| South | 3.1 | 2.4 to 3.8 | 2.1 | 1.5 to 2.7 | 1.3 | 0.8 to 1.7 | 2235 | 17.5 |
| Bangkok | 3.7 | 3.1 to 4.4 | 4.1 | 3.5 to 4.8 | 2.6 | 2.0 to 3.1 | 3290 | 25.8 |
| Types of educational institutions (n=12 699) | ||||||||
| High school | 1.3 | 0.9 to 1.0 | 1.6 | 1.2 to 1.9 | 1.3 | 0.9 to 1.6 | 4258 | 32.1 |
| Vocational school | 7.9 | 7.1 to 8.6 | 4.2 | 3.6 to 4.8 | 2.5 | 2.0 to 2.9 | 4366 | 33.4 |
| College/university | 3.6 | 3.0 to 4.1 | 4.6 | 3.9 to 5.2 | 3.4 | 2.8 to 3.9 | 4075 | 31.9 |
| Age (year) | ||||||||
| 15–17 | 2.9 | 2.3 to 3.3 | 1.9 | 1.6 to 2.3 | 1.6 | 1.2 to 1.9 | 5034 | 39.4 |
| 18–21 | 5.4 | 4.8 to 5.9 | 4.2 | 3.6 to 4.6 | 2.4 | 2.0 to 2.7 | 6533 | 51.2 |
| 22–24 | 4.6 | 3.3 to 5.6 | 6.1 | 4.7 to 7.4 | 5.5 | 4.2 to 6.7 | 1200 | 9.4 |
| Sex identification | ||||||||
| Male | 7.4 | 6.8 to 8.1 | 4.9 | 4.4 to 5.4 | 3.5 | 3.0 to 3.9 | 5983 | 47.0 |
| Female | 1.4 | 1.1 to 1.6 | 2.2 | 1.9 to 2.6 | 1.3 | 1.1 to 1.6 | 6512 | 51.2 |
| LGBTQ+ | 3.8 | 1.4 to 6.3 | 2.5 | 0.5 to 4.5 | 2.6 | 0.5 to 4.5 | 234 | 1.8 |
Dual is the dual-use of cigarettes and e-cigarettes. 95% CI is a 95% CI for the percentage.
Cig, cigarettes; LGBTQ+, lesbian, gay, bisexual, transgender, queer and other sexual identities.