Table I. Study sample characteristics (N=1449).

	Unweighted		Weighted to Current Population Survey
	Mean (SD)	%	Mean (SE)	%
Age (years)	49.5 (16.9)		46.6 (0.6)
Sex
Male		48.7		49.5
Female		51.3		50.4
Race/Ethnicity
White		76.6		69.4
African-American		7.5		10.6
Hispanic		10.0		13.9
Other		5.9		6.0
Education
Completed high school or below		33.7		40.4
Some college		31.9		29.6
College graduate or higher		35.5		30.0
Annual household income
<$25,000		15.7		16.4
$25,000-49,999		23.7		22.9
≥$50,000		60.7		60.7
Health Status (scale of 1-6 from very poor to excellent)a	4.3 (0.9)		4.3 (0.0)
Smoking Status
Non-smoker		55.8		55.9
Former		29.1		27.1
Current		15.1		17.0
E-cigarette use
Never tried e-cigarettes		87.9		86.4
Tried e-cigarettes but not in the last 30 days		8.1		9.2
Used e-cigarettes in the last 30 days		3.9		4.4
Observed others vaping (scale of 1 to 4 from never to five times of more in the past 30 days)	1.2 (0.4)		1.3 (0.0)
Perceived harm of breathing vapor to health (two-item scale of 1 to 7 from not at all harmful to very harmful)	3.8 (1.9)		3.8 (0.1)
Breathing vapor is more harmful compared to breathing smokea (scale of 1 to 5 from much less to much more harmful)	2.0 (0.8)		2.0 (0.0)
Correct knowledge (3-item scale of 1 to 3 from incorrect to correct)b	2.0 (0.3)		2.0 (0.0)

Notes.

^a6 cases missing,

^b2 cases missing.