Table 1.

Participant sociodemographics

	2016		2017
	Unweighted n	Weighted %/mean (95% CI)	unweighted n	Weighted %/mean (95% CI)	P values*
Total	6014	-	5992	-
Sex
Male	3013	48.0 (46.5 to 49.6)	2987	48.1 (46.6 to 49.6)	0.923
Female	3001	52.0 (50.4 to 53.5)	3005	51.9 (50.4 to 53.4)
Age (years)
18–29	981	20.8 (19.5 to 22.3)	1092	20.8 (19.5 to 22.1)	0.992
30–44	1213	24.8 (23.5 to 26.2)	1183	24.9 (23.6 to 26.4)
45+	3820	54.3 (52.8 to 55.9)	3717	54.3 (52.7 to 55.8)
Education
Less than high school	297	10.8 (9.6 to 12.1)	326	10.8 (9.7 to 12.1)	0.961
High school	1781	29.3 (27.9 to 30.6)	1345	28.9 (27.5 to 30.4)
Some college	1876	28.8 (27.5 to 30.2)	2014	28.6 (27.4 to 29.9)
College graduate or more	2060	31.1 (29.8 to 32.5)	2307	31.6 (30.3 to 33.0)
Race/ethnicity
White, NH	4434	65.1 (63.5 to 66.6)	4365	64.3 (62.8 to 65.9)	0.919
Black, NH	547	11.8 (10.8 to 12.9)	600	11.8 (10.8 to 12.8)
Hispanic	672	15.3 (14.1 to 16.6)	639	15.8 (14.6 to 17.2)
Other, NH	361	7.8 (6.9 to 8.9)	388	8.0 (7.1 to 9.1)
Income
Less than $30 000	1486	20.7 (19.6 to 22.0)	1290	19.1 (18.0 to 20.3)	0.067
$30 000-$99 900	3144	47.4 (45.9 to 49.0)	2961	47.0 (45.6 to 48.5)
$100000+	1384	31.8 (30.3 to 33.4)	1741	33.9 (32.4 to 35.3)
Cigarette smoking status
Never	3107	59.7 (58.2 to 61.2)	3061	56.4 (54.9 to 57.8)	0.003
Former	1619	27.1 (25.8 to 28.4)	1660	28.7 (27.3 to 30.0)
Current	1288	13.2 (12.3 to 14.1)	1271	15.0 (14.0 to 16.0)
ENDS use status
Never	4821	83.9 (82.7 to 85.0)	4664	79.7 (78.5 to 80.9)	0.000
Former	792	10.7 (9.8 to 11.7)	786	11.8 (10.8 to 12.8)
Current	390	5.4 (4.8 to 6.1)	542	8.5 (7.7 to 9.4)
Early adopter propensity†	4832	5.11 (5.03 to 5.19)	5612	5.28 (5.22 to 5.35)	0.001

^*χ² test.

^†Range from 3 to 12.

ENDS, electronic nicotine delivery systems; NH, non-Hispanic.