Table 4.

Patterns of e-cigarette use among pregnant dual users (n = 66)

Characteristic	n (%)
Last time used e-cigarette
Within the past day	38 (61.3%)
Within the past 2 days	5 (8.1%)
Within the past 3 days	4 (6.4%)
More than 3 days ago	15 (24.2%)
Concentration of nicotine in most recent e-cigarette
0 mg	5 (8.2%)
1 mg – 6 mg	33 (54.1%)
7 mg – 12 mg	10 (16.4%)
13 mg – 18 mg	3 (4.9%)
19 mg – 25 mg	5 (8.2%)
25 mg or more	3 (4.9%)
Decline to answer	2 (3.3%)
Number of days used an e-cigarette in past 30 days
Less than 10 days	18 (28.6%)
10–15 days	18 (28.6%)
16–29 days	3 (4.8%)
Daily	26 (41.3%)
Number of times per day of e-cigarette use, median (interquartile range)	8 (3 – 15)
E-cigarette flavors currently using (select all that apply; % checked)
Mint/menthol (n = 23)	34.9%
Clove/spice (n = 2)	3.0%
Fruit (n = 42)	63.6%
Chocolate (n = 2)	3.0%
Alcoholic drink flavor (n = 1)	1.5%
Candy or other sweets (n = 18)	27.3%

Note: numbers vary due to sporadically missing data