Male, % (n) |
72.2 (2,604) |
Mean age (SD) |
40.5 (12.6) |
White, % (n) |
92.0 (3,319) |
With college degree, % (n) |
40.7 (1,467) |
Live in United States, % (n) |
84.8 (3,062) |
Mean number of lifetime cigarette quit attempts (SD) |
8.6 (15.5) |
Mean number of months since quitting smoking (SD) (n = 3,281) |
12.7 (12.2) |
Mean length of e-cig use in months (SD) |
13.4 (12.9) |
Mean E-liquid nicotine concentration, mg/ml (SD) |
15.5 (8.6) |
Mean number of E-cigs used before current model (n = 3,601) |
4.2 (4.1) |
Use e-cig liquid >12mg/ml, % (n) |
50.8 (1,834) |
Who started using E-cigs with intention to quit smoking, % (n) |
74.4 (2,684) |
Who quit smoking cigarettes prior to using E-cig, % (n) |
8.8 (317) |
Who plan to continue using e-cig for at least another year, % (n) |
78.8 (2,845) |
E-cig larger than regular cigarette, % (n) |
87.1 (3,145) |
E-cig cost > $50 (n = 3,583), % (n) |
55.7 (1,994) |
E-cig purchased at gas (petroleum) station, % (n) |
9.2 (331) |
Use only Vegetable Glycerin E-liquid, % (n) |
8.8 (234) |
E-cig with button to press prior to inhalation, % (n) |
84.7 (3,056) |
E-cig with button to control battery voltage, % (n) |
61.9 (2,234) |
E-cig uses single 3.7-V battery, % (n) |
72.7 (2,622) |
E-cig requires more than 1 battery, % (n) |
4.9 (175) |
E-cig uses proprietary battery, % (n) |
30.3 (1,095) |
Switched to current brand because it gives a more satisfying “hit,” % (n) |
74.8 (2,699) |