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F.R.Carey et d Addictive Behaviors Reports 8(2018)95 101 ■Ever Use at 6 Months a Ever Use at 12 Months .Ever Use at 18 Months 16 15 13.8 14 13 * 12.3 12 11.3 11 10 9.4 9 Ever 8 * 7.4 Use 7 6.3 6.6 6 5 4.6 4 * * 3.8 3.8 3.5 3.7 3 2.1 2.8 2.6 2.7 2.4 2.3 * 1.5 1.7' 1 , ■- 0.0 002 0.4 ' 0.61.0 1.1� 0.71 ■® ■ 11 Non-Susceptible Susceptible Non-Susceptible Susceptible Non-Susceptible Susceptible Non-Susceptible Susceptible Non-Susceptible Susceptible E-Cigarettes Cigarettes Hookah Cigars Any Combustible Fig.1.Comparison of susceptibility at baseline among never users and subsequent ever use of each product at 6,12,and 18 months.Note:*indicates p < 0.05 for the Chi-square test of group differences in ever use of each specific product at each time point by susceptibility status for each specific product at baseline. 12 months and 5.9%at 18 months, versus 0.9%and 1.7% of non-sus- times higher odds of ever use of any combustible product at 12 and ceptible adolescents,respectively(p < 0.05 for both). 18 months, respectively. Similarly, susceptibility to any combustible In the adjusted logistic regression models (Table 3) examining the product significantly predicted ever use at all time points, with sus- association between susceptibility and ever use at 6,12,and 18 months ceptible adolescents having 5.20(95%Cl: 1.92-14.07), 3.89(95%Cl: for e-cigarettes,age was the only covariate significantly associated with 2.17-6.95),and 3.38(95%Cl:2.03-5.62)times higher odds of ever use ever use at any time point. Each year increase in age was associated of any combustible product at 6, 12, and 18 months, respectively, with 1.46 (95% CI: 1.17-1.82), 1.55 (95% Cl: 1.31-1.84), and 1.33 compared to non-susceptible adolescents. There were no significant (95%CI:1.08-1.64)times higher odds of e-cigarette ever use at 6, 12, interactions between ethnicity and susceptibility to e-cigarettes or any and 18 months, respectively. Similarly, susceptibility to e-cigarettes combustible product at any time point. significantly predicted ever use across time points, with susceptible adolescents having 6.64 (95% CI: 3.39-13.00), 5.01 (95% CI: 2.69-9.34), and 2.88 (95% Cl: 1.66-4.97) times higher odds of a-ci- 4. Discussion garette ever use at 6,12,and 18 months,respectively,compared to non- susceptible adolescents. Among this population of Texas adolescents,we observed the three- For models considering any combustible product, age was sig- item susceptibility measure adapted from Pierce et al. (2005)was ro- nificantly associated with ever use,with each year increase in age being bust across tobacco products and ethnic groups. Consistent with our associated with 1.33(95%Cl:1.09-1.62)and 1.34(95%CI:1.16-1.54) first hypothesis and past research examining susceptibility in the con- text of cigarettes (Nodora et al., 2014; Pierce et al., 1996, 2005), we Table 3 Adjusted logistic regression of susceptibility to each product at baseline on ever use at 6 months,12 months,and 18 months among never users at baseline(n=2844; N=318,097 at baseline). Variable Ever use at 6 months Ever use at 12 months Ever use at 18 months OR 95%CI p-Value OR 95%Cl p-Value OR 95%CI p-Value E-cigarettes Sex(ref:female) Male 1.30 0.61-2.76 0.488 1.08 0.73-1.61 0.700 1.31 0.88-1.96 0.185 Age 1.46 1.17-1.82 0.001 1.55 1.31-1.84 <0.001 1.33 1.08-1.64 0.008 Family SES(ref:middle) High 1.65 0.55-4.98 0.368 1.00 0.45-2.20 0.993 1.24 0.63-2.44 0.521 Low 0.64 0.22-1.89 0.412 0.45 0.18-1.12 0.085 0.83 0.33-2.07 0.682 Ethnicity(ref:non-Hispanic) Hispanic 1.29 0.60-2.76 0.599 0.99 0.60-1.63 0.966 0.93 0.60-1.44 0.740 Susceptible to e-cigarettes(ref no) Yes 6.64 3.39-13.00 <0.001 5.01 2.69-9.34 <0.001 2.88 1.66-4.97 <0.001 Any combustible product Sex(ref:female) Male 0.85 0.33-2.15 0.725 0.97 0.50-1.89 0.920 1.05 0.59-1.87 0.867 Age 1.18 0.88-1.59 0.267 1.33 1.09-1.62 0.005 1.34 1.16-1.54 <0.001 Family SES(ref:middle) High 0.54 0.10-2.81 0.458 1.17 0.58-2.38 0.662 1.30 0.74-2.26 0.356 Low 1.08 0.29-4.03 0.904 1.21 0.49-3.03 0.673 1.19 0.59-2.43 0.620 Ethnicity(ref:non-Hispanic) Hispanic 0.74 0.27-2.14 0.575 0.97 0.48-1.95 0.930 0.99 0.61-1.63 0.983 Susceptible to any combustible(ref:no) Yes 5.20 1.92-14.07 0.001 3.89 2.17-6.95 <0.001 3.38 2.03-5.62 <0.001 Note:OR=odds ratio,Cl=confidence interval,SES=socioeconomic status."Any combustible"includes cigarettes,cigars,and hookah. 99