Table 4.

Associations between e-cigarette marketing exposure and e-cigarette susceptibility and future e-cigarette initiation among youth in the PATH study who were tobacco naïve at wave 1 (2013–2014), and e-cigarette naïve at wave 2 (2014–2015)

	E-Cigarette susceptibility wave 2 (n = 6,470)		E-Cigarette initiation wave 3 (n = 6,462)
	AOR	95% CI	AOR	95% CI
Marketing exposurea		-		-
Convenience store visit frequency (past 30 days)		-		-
Never (ref)
1 –3 times in 30 days	1.35	1.13–1.61	1.48	1.03–2.12
Once per week or more often	1.51	1.25–1.81	1.79	1.29 – 2.48
Noticed retail e-cigarette ads (ever vs. never, ref)	1.36	1.18–1.57	1.03	.78–1.36
Has a favorite branded e-cigarette ad (yes vs. no, ref)	1.31	1.10–1.56	1.60	1.18–2.17
Peer and family factorsa
Best friend(s) use e-cigarettes (any vs. none, ref)	2.69	2.32–3.12	2.19	1.76–2.74
Household tobacco user (any vs. none, ref)	1.34	1.15–1.56	1.34	1.01–1.79
E-cigarette susceptibility and tobacco product use
E-cigarette susceptible at wave 1 (vs. not susceptible, ref)	2.91	2.59–3.28	1.27	1.00–1.62
E-cigarette susceptible at wave 2 (vs. not susceptible, ref)	NA	NA	2.38	1.88 −3.00
Cigarette initiation at wave 2	6.28	3.19–12.38	3.94	1.95 −7.96
Other tobacco productb initiation at wave 2	3.31	2.25–4.87	1.90	1.16–3.13

Data are weighted.

Models additionally adjusted for sex, age, parent education, race/ethnicity, region, and sensation-seeking score.

AOR = adjusted odds ratio; NA = not applicable to model.

^aMeasured at wave 2.

^bOther tobacco products include cigars (cigarillos, traditional and filtered), hookah, smokeless, snus, dissolvable, bidis, and kreteks).