Table 1.

Characteristics of the baseline sample

		All (N = 2622)		Lifetime marijuana non-users (n = 1162)		Lifetime marijuana users (n = 1434)		Current e-cigarette users (n = 812)
		Mean (SD)	%	Mean (SD)	%	Mean (SD)	%	Mean (SD)	%
Age		21.2 (2.2)		20.8 (2.1)		21.5 (2.2)		21.2 (2.2)
Gender
	Men		46		51		41		53
	Women		54		49		59		47
Ethnicity
	White		25		18		30		23
	Asian		26		32		21		23
	Filipino		18		21		15		19
	NHPI		21		20		22		26
	Other		11		9		12		9
Family Income
	0–$39 K		23		25		21		22
	$40 K – $79 K		33		35		32		35
	$80 K – $119 K		26		25		25		24
	$120 K – $159 K		10		9		10		10
	Over $160 K		9		6		11		10
Cigarette smoking
	Never		47		75		26		19
	Former/Experimenter		31		16		43		37
	Current		22		9		31		44
E-cigarette use
	Never		35		61		13
	Experimenter		34		28		53
	Current		31		11		34
Lifetime marijuana use
	Has not used		54				0		25
	Has used but not vaped		38				72		25
	Has vaped		16				28		50
Past-30-day marijuana use
	Has used but not vaped		20				36		25
	Has vaped		7				13		23
Presence in social networksa
	Cigarette smokers	1.9 (1.1)		1.6 (0.9)		2.2 (1.1)		2.4 (1.2)
	E-cigarette users	1.9 (1.1)		1.6 (1.0)		2.0 (1.2)		2.6 (1.3)
	Marijuana users	2.3 (1.3)		1.7 (1.0)		2.8 (1.3)		2.9 (1.3)
	Those who visit vape shops often	1.7 (1.1)		1.6 (0.9)		1.8 (1.1)		2.2 (1.2)
	Those who Know someone who works at a vape shop	2.3 (1.4)		2.2 (1.4)		2.4 (1.4)		2.5 (1.5)
Ever exposed to direct marketing
	Mail, e-mail, text messages		25.5		9.3		20.3		30.2
	Social media		9.2		5.4		12.1		15.3

Notes. SD = Standard Deviation; NHPI: Native Hawaiian/Other Pacific Islader;

^aRange = 1–5