Table 1.

Adulta E‐cigarette use in various countries

Country	Year	Current smoker (%)	Ever users				Current usersa
			Total (%)	Nonsmoker (%)	Current smoker (%)	Ex smoker a (%)	Total (%)	Nonsmoker (%)	Current smoker (%)	Ex smokera (%)
USA1	2014		12.6	3.2	47.6	55.4	3.7	0.4	15.9	22.2
Australia (NSW)2	2015		8.4	3.2	36.5	N/A	1.3	0.7	4.9	N/A
Canada3	2013		8.5	3.0	37.3	5.1	1.8	0.3	9.6	0.9
UK4	2012	18.8	5.3	0.5	40.1	3.8	1.6	0.1	13	1.1
Korea5	2013	24.1	6.6	0.7	21.8	4.8	1.1	0.2	0.3	4
New Zealand6	2014	16.2	13.1	3.4	49. 9	8.4	0.8	0.1	4.0	0.1
Japan7	2015	20.5	6.6	3.51	18.3	7.7	1.29	0.6	3.2	1.75

^aDefinition of “adult”, “current use”, and “ex‐smoker” differs between studies. Ever Use is define as having ever tried an E‐cigarette even once^1‐6. ¹Dockrell et al. 2013; ²Harrold et al. 2015; ³Reid et al. 2015; ⁴Schoenborn and Gindi 2015; ⁵Lee et al. 2016; ⁶Li et al., 2015; ⁷Tabuchi et al. 2016).