Table 1.

Sample demographics and e-cigarette/tobacco use characteristics (n=81).

Characteristic	N	%
Age (M, SD)	37.6	11.4
Gender
Women	43	53.1
Men	33	40.7
Transgender or other	2	2.5
Did not respond	3	3.7
Ethnicity
Hispanic/Latino(a)	12	14.8
Race
American Indian/Alaskan Native	0	0
Asian	4	4.9
Native Hawaiian/Pacific Islander	1	1.2
Black/African American	11	13.6
White/European American	60	74.1
More than one race	2	2.5
Did not respond	4	4.9
Education
High School diploma or GED	13	16.0
Some college credit, but less than 1 year	11	13.6
1 or more years of college, no degree	18	22.2
Associate’s degree	10	12.3
Bachelor’s degree	20	24.7
Higher than a bachelor’s degree	6	7.4
Did not respond	4	4.9
Regular e-cigarette use history 1
0–3 months	5	6.2
4–6 months	10	12.3
7–12 months	16	19.8
Between 1–2 years	16	19.8
More than 2 years	33	40.7
Did not respond	2	2.5
E-cigarette use frequency
At least once per day	12	14.8
Every once in a while throughout the day	24	29.6
Fairly frequently throughout the day	22	27.2
Almost always throughout most of the day	22	27.2
Did not respond	2	2.5
Regular e-cigarette device
Prefilled disposable/Cig-alike	11	13.6
E-hookah	1	1.2
Vape pen/eGo style device	10	12.3
Rebuildable/Mechanical Mod or Box Mod	24	29.6
E-cigar	2	2.5
Pod mod such as JUUL	32	39.5
E-cigarette liquid nicotine concentration
0–4 mg/ml	17	21.0
5–10 mg/ml	21	25.9
11–20 mg/ml	13	16.0
21–30 mg/ml	8	9.9
31–40 mg/ml	1	1.2
50–60 mg/ml	14	17.1
Don’t know	5	6.1
E-cigarette liquid flavor preference
Menthol or mint	25	30.9
Tobacco	14	17.3
Fruit	20	24.7
Other (including clove, spice, nut, alcoholic drink, coffee/tea, candy, or dessert)	20	24.7
E-cigarette use after waking
After 60 minutes	20	24.7
31–60 minutes	16	19.8
6–30 minutes	19	23.5
Within 5 minutes	24	29.6
E-cigarette Dependence Scale - Reach for e-cigarette 2
Never	3	3.7
Rarely	8	9.9
Sometimes	30	37.0
Often	25	30.9
Almost always	13	16.0
E-cigarette Dependence Scale – Vape more before not allowed 2
Never	9	11.1
Rarely	7	8.6
Sometimes	24	29.6
Often	21	25.9
Almost always	18	22.2
E-cigarette Dependence Scale - Drop everything to buy e-cigarettes 2
Never	15	18.5
Rarely	20	24.7
Sometimes	28	34.6
Often	10	12.3
Almost always	5	6.2
E-cigarette Dependence Scale - Craving gets intolerable 2
Never	15	1853
Rarely	14	17.3
Sometimes	27	33.3
Often	17	21.0
Almost always	6	7.4
Lifetime use of 100+ cigarettes
Yes	70	86.4
Current use of other tobacco products
Cigarettes	48	59.3
Cigar	9	11.1
Cigarillo or little cigar	17	21.0
Smokeless	5	6.2
Waterpipe	15	18.5

Note. Total n and percentages for sample characteristics is based on the 81 participants who completed the participant questions.

¹Regular use was defined as using an e-cigarette some days or most days.

²Items from the 4-item E-cigarette Dependence Scale [37] including “I find myself reaching for my e-cigarette without thinking about it,” “I drop everything to go out and buy e-cigarettes or e-juice,” I vape more before going into a situation where vaping is not allowed,” and “When I haven’t been able to vape for a few hours, the craving gets intolerable.”