Table 2 Associations between exposure to e-cigarette use in others and past quit attempts, high motivation to stop smoking and prospective quit attempts
|  | Past quit attempts (n = 12,787) | High motivation to stop smoking (n = 12,787) | Prospective quit attempts (n = 1580) | ||||||
|---|---|---|---|---|---|---|---|---|---|
% [95% CI] | RRadj [95% CI] | p | % [95% CI] | RRadj [95% CI] | p | % [95% CI] | RRadj [95% CI] | p | |
Exposure to e-cigarette use by others | |||||||||
 No | 26.8 [25.9–27.7] | 1.00 | – | 14.2 [13.6–15.0] | 1.00 | – | 31.3 [28.7–34.0] | 1.00 | – |
 Yes | 32.3 [30.8–33.9] | 0.97 [0.89–1.06] | 0.546 | 16.6 [15.4–17.9] | 0.99 [0.88–1.11] | 0.839 | 34.4 [29.9–39.2] | 0.94 [0.74–1.20] | 0.627 |
Age | |||||||||
 16–24 | 29.8 [28.0–31.6] | 1.00 | – | 13.6 [12.3–15.0] | 1.00 | – | 38.3 [31.7–45.4] | 1.00 | – |
 25–34 | 33.1 [31.3–35.0] | 1.10 [0.98–1.24] | 0.094 | 17.1 [15.6–18.6] | 1.24 [1.06–1.45] | 0.007 | 40.1 [33.7–46.9] | 1.05 [0.72–1.53] | 0.783 |
 35–44 | 32.0 [30.0–34.0] | 1.05 [0.93–1.19] | 0.430 | 18.6 [17.0–20.4] | 1.34 [1.14–1.57] | < 0.001 | 35.7 [29.7–42.3] | 0.91 [0.62–1.33] | 0.626 |
 45–54 | 27.0 [25.1–28.9] | 0.89 [0.79–1.01] | 0.067 | 16.4 [14.9–18.0] | 1.17 [0.99–1.37] | 0.066 | 35.2 [30.2–40.5] | 0.92 [0.65–1.30] | 0.629 |
 55–64 | 24.9 [23.0–26.9] | 0.83 [0.73–0.95] | 0.006 | 13.2 [11.8–14.8] | 0.96 [0.80–1.15] | 0.652 | 25.5 [21.1–30.6] | 0.67 [0.47–0.97] | 0.035 |
 65+ | 20.1 [18.3–22.0] | 0.71 [0.62–0.82] | < 0.001 | 9.1 [7.8–10.5] | 0.68 [0.56–0.83] | < 0.001 | 24.1 [19.7–29.2] | 0.65 [0.45–0.96] | 0.028 |
Sex | |||||||||
 Men | 26.9 [25.8–27.9] | 1.00 | – | 13.7 [12.9–14.6] | 1.00 | – | 31.7 [28.6–35.0] | 1.00 | – |
 Women | 29.8 [28.6–31.0] | 1.10 [1.02–1.19] | 0.012 | 16.2 [15.3–17.1] | 1.16 [1.05–1.28] | 0.003 | 32.5 [29.2–35.9] | 1.02 [0.83–1.24] | 0.877 |
Social grade | |||||||||
 ABC1 | 29.8 [28.5–31.0] | 1.00 | – | 16.7 [15.8–17.8] | 1.00 | – | 34.6 [31.2–38.3] | 1.00 | – |
 C2DE | 27.2 [26.2–28.2] | 0.93 [0.86–1.00] | 0.053 | 13.6 [12.8–14.4] | 0.83 [0.75–0.91] | < 0.001 | 30.1 [27.2–33.2] | 0.87 [0.71–1.07] | 0.175 |
Exposure to cigarette smoking by others | |||||||||
 No | 27.8 [26.4–29.1] | 1.00 | – | 15.7 [14.6–16.8] | 1.00 | – | 29.7 [26.1–33.6] | 1.00 | – |
 Yes | 28.5 [27.5–29.4] | 0.99 [0.91–1.08] | 0.777 | 14.4 [13.7–15.2] | 0.89 [0.80–0.99] | 0.033 | 33.4 [30.6–36.4] | 1.05 [0.83–1.31] | 0.703 |
Own e-cigarette use†| |||||||||
 No | 23.0 [22.2–23.8] | 1.00 | – | 12.4 [11.8–13.1] | 1.00 | – | 29.2 [26.8–31.8] | 1.00 | – |
 Yes | 49.8 [47.8–51.7] | 2.14 [1.97–2.33] | < 0.001 | 25.0 [23.3–26.7] | 1.95 [1.75–2.18] | < 0.001 | 42.8 [37.6–48.1] | 1.44 [1.14–1.83] | 0.002 |
Survey year | – | 1.00 [0.97–1.04] | 0.925 | – | 1.02 [0.97–1.07] | 0.425 | – | 0.95 [0.76–1.19] | 0.537 |