Table 4.

Susceptibility to tobacco use and substance use onset among W1 youth never substance users (n = 5325).

	Wave 2
	Onset of substance use
	Never use^a			Exclusive tobacco use^b						Exclusive alcohol use					Exclusive marijuana use^c

Wave 1	n^g	%^h	SE^h	n^g	%^h	SE^h	ORⁱ	95% CIⁱ		n^g	%^h	SE^h	ORⁱ	95% CIⁱ	n^g	%^h	SE^h	ORⁱ
Total	4090	77.0	0.7	246	4.4	0.3				422	8.2	0.4			53	0.9	0.1
	Unadjusted model
Susceptibility to tobacco use^j
No	2956	81.9	0.8	113	3.0	0.3		Referent		255	7.3	0.5	Referent		29	0.7	0.1	Referent
Yes	1134	66.2	1.3	133	7.4	0.6	3.1	2.3	4.1	167	10.1	0.8	1.7	2.1	24	1.2	0.3	2.1
	Adjusted model^k
Susceptibility to tobacco use^j
No	2956	81.9	0.8	113	3.0	0.3		Referent		255	7.3	0.5	Referent		29	0.7	0.1	Referent
Yes	1134	66.2	1.3	133	7.4	0.6	2.4	1.7	3.3	167	10.1	0.8	1.5	1.8	24	1.2	0.3	1.6

	Wave 2
	Onset of substance use
	Exclusive marijuana use^c		Exclusive other drug use^d						Poly-substance including tobacco use^e						Poly-substance excluding tobacco use^f

Wave 1	95% CIⁱ		n^g	%^h	SE^h	ORⁱ	95% CIⁱ		n^g	%^h	SE^h	ORⁱ	95% CIⁱ		n^g	%^h	SE^h	ORⁱ	95% CIⁱ
Total			174	3.1	0.3				258	5.0	0.4				82	1.4	0.2
	Unadjusted model
Susceptibility to tobacco use^j
No		Referent	131	3.5	0.3		Referent		89	2.5	0.3		Referent		43	1.2	0.2		Referent
Yes	1.1	4.0	43	2.4	0.4	0.9	0.6	1.3	169	10.7	1.1	5.4	3.9	7.5	39	2.0	0.4	2.2	1.3	3.6
	Adjusted model^k
Susceptibility to tobacco use^j
No		Referent	131	3.5	0.3		Referent		89	2.5	0.3		Referent		43	1.2	0.2		Referent
No
Yes	0.8	3.1	43	2.4	0.4	0.8	0.5	1.2	169	10.7	1.1	3.9	2.8	5.6	39	2.0	0.4	1.8	1.1	3.0

Statistically significant associations at p < .05 indicated in bold text.

Reference group.

Refers to cigarettes, e-cigarettes, traditional cigars, cigarillos, filtered cigars, pipe, hookah, snus pouches, smokeless tobacco excluding snus pouches, or dissolvable tobacco.

Includes use of cigars as blunts.

Includes non-prescribed Ritalin/Adderall, non-prescribed painkillers/sedatives, cocaine and other stimulants, heroin, inhalants, solvents, and hallucinogens.

Includes use of two or more substances (tobacco, alcohol, marijuana, and other drugs).

Includes use of two or more substances (alcohol, marijuana, and other drugs).

n represents unweighted sample sizes.

Percents (%) and standard errors (SEs) represent weighted estimates.

ⁱ

Odds ratios (ORs) and 95% confidence intervals (CIs) from multinomial logistic regression models.

Defined as the strongest rejection to questions regarding curiosity about tobacco products, intention not to use tobacco products, and resistance of an offer to use tobacco products from a best friend.

Adjusted for age, sex, race/ethnicity, academic performance, sensation seeking, tobacco product user in household, receptivity to tobacco product advertising, and lifetime mental health problems at Wave 1.