Table 3.

Changes in the frequency of e-cigarette use among past 30-day e-cigarette users, 2014–2018.

	MATS 2014				MATS 2018
	N*	Infrequent (1–5 days) %	Intermediate (6–29 days) %	Daily (30 days) %	N*	Infrequent (1–5 days) %	Intermediate (6–29 days) %	Daily (30 days) %
Smoking status
Current smoker†	277	59.0	28.7	12.3	88	49.2	18.6	32.2
Former smoker	86	43.2	16.0	49.9	51	21.6	25.9	52.5
Never smoker†	49	89.5	5.4	5.1	94	54.8	20.6	24.6
Age
18-24†	91	72.8	16.6	10.7	96	49.4	25.6	25.0
25-44†	159	53.5	30.3	16.2	88	43.6	17.5	38.9
45–64	138	55.8	16.5	27.7	43	43.5	17.0	39.5
65 and older	25	44.9	25.6	26.5	10	53.2	26.2	20.6
Gender
Male	230	54.4	24.0	21.6	163	44.3	23.3	32.4
Female†	183	65.1	21.9	13.0	74	49.9	16.9	33.2
Education
Less than high school	28	55.4	32.1	12.5	19	54.8	17.3	28.0
High-school graduate/GED†	132	55.9	22.3	21.8	78	37.4	19.1	43.6
Some college or technical school	174	57.2	25.1	17.7	91	45.9	24.5	29.6
College graduate or beyond	78	74.1	11.4	14.5	47	59.1	21.5	19.4

*Ns in this table are the unweighted number of survey respondents, though all percentages are weighted.

†Change from 2014 to 2018 within this group is statistically significant at p ≤ 0.05.