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. 2017 Dec 19;7(12):e018469. doi: 10.1136/bmjopen-2017-018469

Table 2.

Electronic nicotine delivery system (ENDS) use characteristics

ENDS users
(n=27)
Dual users
(n=28)
Age of ENDS initiation, median 28.5 35.0
Age of regular ENDS initiation, median 30.0 36.5
Duration of ENDS use, median 2.0 1.0
Type of ENDS: tank or vapour system, % 88.9 92.9
Type of ENDS: cig-a-like, % 7.4 21.4
Type of ENDS: e-cigar, % 0.0 3.6
Type of ENDS: e-pipe, % 3.7 0.0
Type of ENDS: e-hookah, % 0.0 0.0
ENDS is refillable, % 88.9 100.0
ENDS is rechargeable, % 100.0 96.4
ENDS uses cartridges, % 29.6 33.3
Nicotine concentration, %
 0 mg 0.0 7.7
 1–5 mg 52.0 30.8
 6–12 mg 28.0 30.8
 13–17 mg 8.0 3.9
 18–24 mg 8.0 23.1
 25 mg or more 4.0 3.9
Tobacco flavour, % 18.5 39.3
Menthol flavour, % 14.8 3.6
Clove or spice, % 7.4 17.9
Fruit, % 66.7 53.6
Chocolate, % 7.4 14.3
Alcoholic drink, % 3.6 0.0
Candy/sweets, % 51.9 57.1
Other flavour, % 11.1 21.4
Number of vape sessions in lifetime*, %
 100 or less 33.3 52.0
 101–200 12.5 8.0
 201–300 8.3 8.0
 301–400 12.5 8.0
 Over 400 33.3 24.0
Average number of vape sessions per day*, %
 Less than 10 sessions 28.0 52.0
 10–19 sessions 44.0 20.0
 20–30 sessions 16.0 8.0
 Over 30 12.0 20.0
Average number of puffs per vape session*, %
 Under 5 14.8 23.1
 5–10 55.6 46.2
 More than 10 29.6 30.8
Average length of vape session*, %
 1–2 min 33.3 25.0
 3–5 min 40.7 28.6
 6–10 min 18.5 25.0
 Over 10 min 7.1 21.4

*Provided by the Ontario Tobacco Research Center.