Smoking status of e-cigarette users

Half (49.9%^a) of ever users and a majority (62.8%^b) of past 30-day users of e-cigarettes were current smokers, suggesting that dual use of cigarettes and e-cigarettes is high. One-quarter of ever and recent (past 30 day) e-cigarette users were former smokers. One-quarter of ever users and 12.8% of recent users of e-cigarettes had never been a smoker, indicating some interest among non-smokers (Figure 12.16; Figure 12.17). There were no differences between males and females in the percentages of ever or past 30-day users who were smokers (49.4%^c vs. 50.5%^d and 64.6%^e vs. 60.6%^f, respectively).^153,154

The percentage of ever e-cigarette users who were current smokers varied significantly by age,¹⁵⁵ and was lowest among youth age 15-19 (Figure 12.18). No significant age difference was observed for past 30-day users¹⁵⁶ (Figure 12.19). Never smokers comprised the majority (64.2%^g) of youth ever users and 38.2%^h of past 30-day e-cigarette users; among young adults, never smokers comprised 36.1%ⁱ and 20.1%^j of ever and recent users, respectively. E-cigarette use among never smokers over age 35 was rare. 

95% confidence intervals for in-text estimates 

a: 49.9 [46.1-53.6]
b: 62.8 [54.9-70.8]
c: 49.4 [44.3-54.6]
d: 50.5 [44.8-56.2]
e: 64.6 [54.4-74.7]
f: 60.6 [47.9-73.4]
g: 64.2 [57.5-70.8]
h: 38.2 [25.0-51.4]
i: 36.1 [30.1-42.1]
j: 20.1 [10.7-29.4]