Table 3. Results of Multivariable Multinomial Logistic Regression (Model 1) on E-Cigarette Susceptibility^a and Use Behaviors at Wave 5 (2018–2019) Among Adolescents (n = 7,872) Who Never Used E-Cigarettes at Wave 4 (2016–2018), PATH Study^b .

Wave 4 social media use	Wave 5 e-cigarette susceptibility and use behaviors, adjusted OR (95% CI) [P value]c
	Never used e-cigarettes, but susceptible to e-cigarette use (n = 1,387)	Past e-cigarette use (n = 801)d	Current e-cigarette use (n = 665)e
Never	1 [Reference]	1 [Reference]	1 [Reference]
Nondaily	1.17 (0.88–1.57) [.28]	2.26 (1.51–3.37) [<.001]	1.64 (1.04–2.60) [.03]
Daily	1.46 (1.20–1.78) [<.001]	3.55 (2.49–5.06) [<.001]	3.45 (2.38–5.02) [<.001]

Abbreviation: OR, odds ratio; PATH, Population Assessment of Tobacco and Health.

^a Susceptibility was categorized on the basis of “intention to use” (“Do you think you might try using e-cigarettes soon?”) and “willingness of e-cigarette use” (“If one of your best friends were to offer you e-cigarettes, would you use it?”). Only when respondents reported “definitely not” to both questions were they categorized as “nonsusceptible never-use”; others were categorized as “susceptible never-use.”

^b Data source: Hyland et al (12).

^c The model was controlled for Wave 4 variables of age, sex, ethnicity, race, parental education, annual household income, parental and peer e-cigarette use, e-cigarette use susceptibility, current use of other tobacco products and substances. “Never used e-cigarettes and not susceptible to e-cigarette use” was used as reference group.

^d Initiated e-cigarette use at Wave 5 but did not use e-cigarettes in the past 30 days.

^e Initiated e-cigarette use at Wave 5 and still used e-cigarettes in the past 30 days.