Characteristics and prevalence of SHA and SHS exposure among never tobacco users, National Youth Tobacco Survey, 2016–2017
| n | Proportion (%) | Exposure to SHS in a public place* % (95% CI) | Exposure to SHA in a public place* % (95% CI) | ||
| Overall | – | 24 353 | 100 | 46.6 (45.8 to 47.4) | 18.3 (17.6 to 18.9) |
| Sex | Male | 11 718 | 49.1 | 38.9 (37.7 to 40.0) | 14.8 (14.0 to 15.6) |
| Female | 12 519 | 50.9 | 54.0 (52.8 to 55.1) | 21.6 (20.6 to 22.5) | |
| Race/ethnicity† | White | 10 328 | 53.5 | 50.7 (49.5 to 51.9) | 20.2 (19.2 to 21.1) |
| Black | 3784 | 12.3 | 35.7 (33.7 to 37.8) | 11.4 (10.1 to 12.8) | |
| Hispanic | 6103 | 23.3 | 44.3 (42.7 to 45.9) | 18.9 (17.5 to 20.2) | |
| Other | 3110 | 11 | 48.3 (45.9 to 50.7) | 17.3 (15.5 to 19.1) | |
| School level | Middle school | 13 001 | 52.9 | 44.3 (43.2 to 45.5) | 16.1 (15.2 to 16.9) |
| High school | 11 296 | 47.1 | 49.1 (47.9 to 50.2) | 20.7 (19.8 to 21.6) | |
| Household member tobacco use‡ | None | 16 780 | 71.9 | 41.5 (40.5 to 42.4) | 16.6 (15.9 to 17.3) |
| E-cigarette use (regardless of use of non-e-cigarette tobacco product) | 894 | 4 | 61.0 (56.9 to 65.2) | 56.8 (52.7 to 61.0) | |
| Non-e-cigarette tobacco product use only | 5622 | 24.1 | 60.8 (59.1 to 62.5) | 17.2 (16.0 to 18.5) | |
| SHS exposure in a private space§ | No | 19 203 | 82 | 40.3 (39.4 to 41.2) | 16.5 (15.9 to 17.2) |
| Home only | 1545 | 6.2 | 66.3 (63.1 to 69.4) | 20.3 (17.7 to 22.9) | |
| Car only | 1012 | 4.1 | 75.5 (72.1 to 78.9) | 29.7 (26.0 to 33.3) | |
| Both home and car | 1821 | 7.7 | 83.0 (80.7 to 85.3) | 29.5 (26.7 to 32.2) | |
| Comprehensive indoor air laws | Covering both cigarettes and e-cigarettes | 4396 | 22.6 | 48.9 (47.0 to 50.7) | 21.2 (19.7 to 22.7) |
| Covering cigarettes only | 7456 | 30.7 | 48.5 (47.0 to 50.0) | 17.3 (16.2 to 18.4) | |
| None | 12 501 | 46.7 | 44.2 (43.1 to 45.3) | 17.5 (16.6 to 18.3) | |
The analytical sample was restricted to 24 353 youth who had never used any tobacco products in their lifetime (including cigarettes, pipes, waterpipes, smokeless tobacco products (snus, dissolvable tobacco products, snuff and chewing tobacco), cigars, bidis and e-cigarettes). Differences statistically significant within all subgroups assessed at P<0.05 using χ2 tests.
*Exposure to SHS and SHA in a public place was assessed by asking, ‘During the past 30 days, on how many days did you breathe [the smoke from someone who was smoking tobacco products/the vapor from someone who was using an electronic cigarette or e-cigarette] in an indoor or outdoor public place?’ Exposure was dichotomised as ‘0’ for 0 days and ‘1’ for 1–30 days.
†All racial/ethnic groups are non-Hispanic unless otherwise specified. ‘Other’ racial/ethnic persons include American Indians/Alaska Natives; Asians; Native Hawaiians/Other Pacific Islanders; and multiracial persons.
‡Household member tobacco use was assessed by asking, ‘Does anyone who lives with you now smoke/use…?’ Non-e-cigarette tobacco products include cigarettes, cigars, smokeless tobacco products, hookahs, pipes and bidis.
§Exposure to SHS in a private space was assessed by asking, ‘During the past 7 days, on how many days [did someone smoke tobacco products in your home while you were there/did you ride in a vehicle when someone was smoking a tobacco product]?’ Exposure was dichotomised as ‘0’ for 0 days and ‘1’ for 1–7 days.
E-cigarette, electronic cigarette; SHA, secondhand aerosol; SHS, secondhand smoke.