Formaldehyde Vapor Concentration in Electronic Cigarettes and Health Complaints of Electronic Cigarettes Smokers in Indonesia

Table 3

Onset of using electronic cigarettes among personal vapor community in Surabaya city in 2016.

Year	Percentage ()
2008	4.0
2012	4.0
2013	4.0
2014	28.0
2015	36.0
2016	24.0

Source: primary data.