Table 3. Weighted Prevalence of E-Cigarette Use (Current and Daily) by Combustible Cigarette Use (Never, Former, and Current) Across Age Groups, 2021 Behavioral Risk Factor Surveillance System.

Age group, y	Weighted prevalence, % (95% CI)
	Total population		Never combustible cigarette use		Former combustible cigarette use		Current combustible cigarette use
	Current	Daily	Current	Daily	Current	Daily	Current	Daily
18-20	18.1 (16.6-19.6)	7.7 (6.9-8.7)	13.9 (12.7-15.3)	5.5 (4.8-6.4)	63.1 (52.3-72.7)	36.0 (26.7-46.6)	67.4 (59.7-74.4)	29.5 (23.6-36.2)
21-24	18.6 (17.5-19.7)	9.0 (8.2-9.8)	11.8 (10.9-12.9)	4.5 (3.9-5.2)	53.8 (49.0-58.5)	39.8 (35.1-44.6)	45.3 (40.6-50.1)	20.2 (17.0-23.9)
25-29	13.4 (12.5-14.3)	6.2 (5.6-6.8)	5.9 (5.2-6.7)	1.6 (1.3-1.9)	33.7 (30.6-36.9)	21.8 (19.4-24.4)	30.3 (27.0-33.8)	13.1 (10.6-16.1)
30-34	9.1 (8.5-9.8)	4.2 (3.8-4.6)	2.6 (2.2-3.1)	0.8 (0.6-1.1)	22.1 (20.1-24.2)	13.8 (12.2-15.4)	19.2 (17.1-21.4)	6.4 (5.4-7.7)
35-39	7.1 (6.5-7.6)	3.2 (2.9-3.6)	1.6 (1.2-2.1)	0.4 (0.3-0.6)	15.1 (13.5-16.7)	10.0 (8.7-11.4)	16.5 (14.6-18.5)	5.0 (3.8-6.5)
40-44	6.0 (5.5-6.6)	3.0 (2.6-3.5)	1.0 (0.7-1.4)	0.4 (0.2-0.7)	12.4 (10.9-14.1)	8.5 (7.3-9.9)	13.8 (12.1-15.8)	4.3 (3.2-5.8)
45-49	4.5 (4.0-5.0)	2.1 (1.8-2.4)	0.9 (0.6-1.2)	0.2 (0.1-0.4)	8.4 (7.3-9.7)	6.2 (5.2-7.3)	12.7 (10.7-15.0)	3.5 (2.5-4.8)
50-54	3.7 (3.3-4.1)	1.8 (1.5-2.2)	0.5 (0.3-0.7)	0.1 (0.1-0.2)	8.0 (6.6-9.5)	5.5 (4.3-6.9)	10.1 (8.6-11.8)	3.4 (2.5-4.7)
55-59	3.2 (2.8-3.6)	1.6 (1.3-1.9)	0.4 (0.3-0.6)	0.1 (0.1-0.2)	6.3 (5.3-7.4)	4.0 (3.2-5.1)	8.2 (6.9-9.6)	2.8 (2.1-3.9)
≥60	1.5 (1.4-1.6)	0.8 (0.7-0.9)	0.4 (0.3-0.5)	0.1 (0.2-0.4)	2.0 (1.7-2.2)	1.1 (1.0-1.3)	5.2 (4.6-5.9)	1.8 (1.4-3.9)