Table 2. Past month use of other tobacco products according to past month use (yes or no) of electronic cigarettes, 2011–2015.
| Females, grades 6–12 | Males, grades 6–12 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall (n: sample size) | Past 30-day e-cigarette use | 1 | Overall (n: sample size) | Past 30-day e-cigarette use | 1 | |||||||||
| Yes (n: sample size) | No (n: sample size) | Yes (n: sample size) | No (n: sample size) | |||||||||||
| Any other tobacco in past month: | ||||||||||||||
| n | % other tobacco (SE) | n | % other tobacco (SE) | n | % other tobacco (SE) | n | % other tobacco (SE) | n | % other tobacco (SE) | n | % other tobacco (SE) | |||
| All years | 50,034 | 12.2 (0.3) | 2,094 | 64.5 (1.9) | 47,940 | 9.8 (0.3) | * | 50,977 | 18.0 (0.4) | 3,183 | 70.2 (1.3) | 47,794 | 14.5 (0.4) | * |
| 2011 | 9,315 | 13.4 (0.8) | 69 | 81.0 (7.6) | 9,246 | 12.9 (0.7) | * | 9,284 | 20.5 (1.0) | 130 | 88.9 (4.1) | 9,154 | 19.2 (0.9) | * |
| 2012 | 12,275 | 12.6 (0.7) | 180 | 89.0 (3.3) | 12,095 | 11.4 (0.6) | * | 12,369 | 19.3 (0.8) | 342 | 87.6 (3.2) | 12,027 | 17.2 (0.7) | * |
| 2013 | 9,177 | 12.8 (0.6) | 213 | 74.6 (5.1) | 8,964 | 11.3 (0.6) | * | 9,216 | 18.0 (1.0) | 332 | 85.2 (2.7) | 8,884 | 15.3 (0.9) | * |
| 2014 | 10,645 | 11.9 (0.6) | 849 | 63.0 (2.8) | 9,796 | 7.5 (0.5) | * | 11,150 | 16.4 (0.8) | 1,183 | 66.2 (2.3) | 9,967 | 10.8 (0.8) | * |
| 2015 | 8,622 | 10.6 (0.8) | 783 | 58.3 (3.5) | 7,839 | 5.8 (0.6) | * | 8,958 | 16.1 (1.0) | 1,196 | 63.3 (2.1) | 7,762 | 9.2 (1.0) | * |
| Trend2 | 0.008 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | ||||||||
| Cigarettes in past month: | ||||||||||||||
| n | % cigarettes (SE) | n | % cigarettes (SE) | n | % cigarettes (SE) | n | % cigarettes (SE) | n | % cigarettes (SE) | n | % cigarettes (SE) | |||
| All years | 50,034 | 7.3 (0.3) | 2,094 | 41.2 (1.6) | 47,940 | 5.7 (0.2) | * | 50,977 | 9.5 (0.3) | 3,183 | 43.7 (1.4) | 47,794 | 7.1 (0.3) | * |
| 2011 | 9,315 | 9.7 (0.8) | 69 | 73.9 (8.1) | 9,246 | 9.3 (0.7) | * | 9,284 | 12.2 (0.8) | 130 | 73.7 (5.2) | 9,154 | 11.1 (0.7) | * |
| 2012 | 12,275 | 8.1 (0.6) | 180 | 78.9 (5.0) | 12,095 | 7.0 (0.5) | * | 12,369 | 11.1 (0.7) | 342 | 74.2 (3.9) | 12,027 | 9.2 (0.6) | * |
| 2013 | 9,177 | 7.9 (0.6) | 213 | 64.8 (5.6) | 8,964 | 6.4 (0.5) | * | 9,216 | 9.6 (0.7) | 332 | 65.4 (4.5) | 8,884 | 7.4 (0.6) | * |
| 2014 | 10,645 | 5.4 (0.4) | 849 | 37.1 (2.3) | 9,796 | 2.7 (0.3) | * | 11,150 | 7.5 (0.6) | 1,183 | 38.3 (2.2) | 9,967 | 4.0 (0.5) | * |
| 2015 | 8,622 | 5.4 (0.5) | 783 | 31.5 (2.4) | 7,839 | 2.8 (0.4) | * | 8,958 | 7.2 (0.7) | 1,196 | 32.3 (2.5) | 7,762 | 3.5 (0.6) | * |
| Trend2 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | ||||||||
| Non-cigarette combustibles3 in past month: | ||||||||||||||
| n | % combustible (SE) | n | % combustible (SE) | n | % combustible (SE) | n | % combustible (SE) | n | % combustible (SE) | n | % combustible (SE) | |||
| All years | 50,034 | 6.1 (0.2) | 2,094 | 30.5 (1.5) | 47,940 | 5.0 (0.2) | * | 50,977 | 10.5 (0.3) | 3,183 | 43.7 (1.3) | 47,794 | 8.2 (0.3) | * |
| 2011 | 9,315 | 6.9 (0.4) | 69 | 46.3 (9.2) | 9,246 | 6.6 (0.4) | * | 9,284 | 12.4 (0.6) | 130 | 66.8 (5.9) | 9,154 | 11.4 (0.5) | * |
| 2012 | 12,275 | 7.3 (0.5) | 180 | 53.2 (4.9) | 12,095 | 6.6 (0.4) | * | 12,369 | 12.2 (0.6) | 342 | 67.6 (4.8) | 12,027 | 10.6 (0.5) | * |
| 2013 | 9,177 | 7.5 (0.5) | 213 | 47.6 (6.2) | 8,964 | 6.5 (0.5) | * | 9,216 | 11.6 (0.6) | 332 | 62.3 (3.6) | 8,884 | 9.6 (0.6) | * |
| 2014 | 10,645 | 4.4 (0.4) | 849 | 27.2 (2.3) | 9,796 | 2.4 (0.3) | * | 11,150 | 8.0 (0.6) | 1,183 | 37.5 (2.4) | 9,967 | 4.7 (0.5) | * |
| 2015 | 8,622 | 4.7 (0.5) | 783 | 24.5 (2.3) | 7,839 | 2.7 (0.4) | * | 8,958 | 8.3 (0.6) | 1,196 | 35.7 (2.3) | 7,762 | 4.3 (0.6) | * |
| Trend2 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | ||||||||
| Smokeless tobacco4 in past month: | ||||||||||||||
| n | % smokeless (SE) | n | % smokeless (SE) | n | % smokeless (SE) | n | % smokeless (SE) | n | % smokeless (SE) | n | % smokeless (SE) | |||
| All years | 50,034 | 1.8 (0.1) | 2,094 | 12.9 (1.1) | 47,940 | 1.3 (0.1) | * | 50,977 | 7.6 (0.3) | 3,183 | 31.8 (1.6) | 47,794 | 5.9 (0.3) | * |
| 2011 | 9,315 | 2.1 (0.2) | 69 | 26.0 (8.3) | 9,246 | 2.0 (0.2) | 9,284 | 9.1 (0.9) | 130 | 51.4 (6.7) | 9,154 | 8.3 (0.8) | * | |
| 2012 | 12,275 | 2.2 (0.2) | 180 | 28.7 (4.9) | 12,095 | 1.8 (0.2) | * | 12,369 | 8.2 (0.6) | 342 | 45.4 (4.1) | 12,027 | 7.1 (0.6) | * |
| 2013 | 9,177 | 1.8 (0.2) | 213 | 19.8 (4.9) | 8,964 | 1.3 (0.2) | * | 9,216 | 6.7 (0.8) | 332 | 29.2 (3.6) | 8,884 | 5.8 (0.7) | * |
| 2014 | 10,645 | 1.7 (0.2) | 849 | 11.1 (1.4) | 9,796 | 0.9 (0.2) | * | 11,150 | 7.2 (0.7) | 1,183 | 31.7 (2.9) | 9,967 | 4.5 (0.6) | * |
| 2015 | 8,622 | 1.5 (0.3) | 783 | 9.6 (1.4) | 7,839 | 0.7 (0.2) | * | 8,958 | 6.8 (0.9) | 1,196 | 27.3 (2.5) | 7,762 | 3.8 (0.7) | * |
| Trend2 | 0.030 | <0.001 | <0.001 | 0.035 | <0.001 | <0.001 | ||||||||
| Hookah in past month: | ||||||||||||||
| n | % hookah (SE) | n | % hookah (SE) | n | % hookah (SE) | n | % hookah (SE) | n | % hookah (SE) | n | % hookah (SE) | |||
| All years | 50,034 | 4.1 (0.2) | 2,094 | 35.0 (2.2) | 47,940 | 2.6 (0.1) | * | 50,977 | 4.4 (0.2) | 3,183 | 30.0 (1.6) | 47,794 | 2.7 (0.1) | * |
| 2011 | 9,315 | 2.5 (0.3) | 69 | 21.1 (8.3) | 9,246 | 2.3 (0.3) | 9,284 | 3.2 (0.4) | 130 | 32.2 (6.5) | 9,154 | 2.7 (0.3) | * | |
| 2012 | 12,275 | 3.0 (0.3) | 180 | 28.1 (4.6) | 12,095 | 2.6 (0.3) | * | 12,369 | 4.2 (0.4) | 342 | 37.6 (4.2) | 12,027 | 3.2 (0.3) | * |
| 2013 | 9,177 | 3.4 (0.3) | 213 | 28.8 (5.1) | 8,964 | 2.7 (0.3) | * | 9,216 | 3.6 (0.3) | 332 | 29.7 (3.4) | 8,884 | 2.6 (0.3) | * |
| 2014 | 10,645 | 6.7 (0.5) | 849 | 38.9 (3.5) | 9,796 | 3.9 (0.4) | * | 11,150 | 6.1 (0.5) | 1,183 | 31.2 (2.8) | 9,967 | 3.3 (0.3) | * |
| 2015 | 8,622 | 4.8 (0.4) | 783 | 34.9 (3.6) | 7,839 | 1.7 (0.3) | * | 8,958 | 5.0 (0.4) | 1,196 | 27.5 (2.5) | 7,762 | 1.7 (0.3) | * |
| Trend2 | <0.001 | 0.108 | 0.913 | <0.001 | 0.100 | 0.074 | ||||||||
As e-cigarette past month use increased, use became less exclusively associated with combustible tobacco use.
1. Chi-square test for difference in use of other tobacco products between past 30-day e-cigarette users and non-users (* = P < 0.001)
2. P-for-linear trend, 2011–2015
3. Non-cigarette combustibles include cigars, pipes, bidis, and kreteks (2011–2013)
4. Smokeless tobacco includes conventional smokeless tobacco, snus, and dissolvable tobacco
Marginal prevalences adjusted across years for grade in school and race/ethnicity
Subgroup sample sizes (n) are the mean sample size over 10 imputations for missing value assignment.
Abbreviations: n = sample size (denominator); SE = standard error