Table 2.

Distribution of e-cigarette liquids among all e-cigarette users and among those e-cigarette users who had tried and those who had never tried conventional cigarettes in 2013 and 2015, %.

	Tried Conventional Cigarettes, %		Never Tried Conventional Cigarettes, %		All E-Cigarette Users, %
Type of Liquid|Year	2013	2015	2013	2015	2013	2015
Liquids with nicotine	69.3	55.9	22.2	21.1	65.3	50.2
Only liquids without nicotine	20.4	25.2	59.3	52.4	23.5	29.7
Do not know	10.4	18.8	18.5	26.5	11.1	20.0
Total, %	100	100	100	100	100	100
n	579	1375	54	275	637	1661
p-value	<0.001		0.454		<0.001