Table 1.

Current Device Use among Smokers Who Use E-Cigarettes

	N	Open systems (n=550)	Closed systems (n=301)	Both systems (n=72)
		% (95% CI)	% (95% CI)	% (95% CI)
Total	923	41.1 (35.8 – 46.4)	51.4 (46.2 – 56.7)	7.4 (4.8 – 10.0)
Gender
Male	321	43.7 (35.4 – 52.0)	48.5 (40.3 – 56.7)	7.8 (3.6 – 12.1)
Female	602	38.8 (32.0 – 45.5)	54.2 (47.6 – 60.9)	7.0 (3.9 – 10.1)
Age (years)
18–24	37	48.5 (25.2 – 71.7)	50.0 (26.7 – 73.2)	1.6 (0.0 – 4.1)
25–44	272	50.6 (41.9 – 59.3)	41.7 (33.3 – 50.1)	7.7 (2.9 – 12.5)
45–64	486	31.4 (24.8 – 37.9)	59.8 (53.0 – 66.6)	8.8 (5.1 – 12.5)
65+	128	27.4 (16.1 – 38.7)	66.6 (54.7 – 78.4)	6.1 (0.8 – 11.3)
Education
≤High school	257	37.9 (29.8 – 45.9)	54.0 (45.9 – 62.2)	8.1 (3.7 – 12.4)
>High school	666	44.9 (38.3 – 51.4)	48.5 (42.2 – 54.8)	6.7 (4.0 – 9.3)
Ethnicity
Non-Hispanic white	756	36.8 (31.1 – 42.6)	56.1 (50.3 – 61.9)	7.1 (4.3 – 9.9)
Non-Hispanic black	42	42.0 (17.7 – 66.2)	55.2 (31.2 – 79.3)	2.8 (0.0 – 6.4)
Hispanic	56	51.4 (34.1 – 68.7)	37.2 (21.2 – 53.2)	11.4 (0.3 – 22.5)
Other	69	63.0 (45.1 – 80.8)	29.2 (13.3 – 45.1)	7.8 (0.0 – 18.1)