Introduction: The aim of the current study is to detail a) frequency of e-cigarette (eCig), b) association with socio-demographic characteristics in a nationally representative sample of adults in United States (US).
Methods: We evaluated 5423 individuals with recorded tobacco use information from the 2013-2014 NHANES mobile examination center component and interview. Demographic, tobacco and drug use information were self-reported. The study population was categorized into 3 groups: 1- every participant that used e-Cig, 2-other tobacco users, and 3-individuals who never use tobacco.
Results: A total of 116 (2.6%) of NHANES participants were found to use e-cigarette (Table1). Of e-Cig users, 68.1%, 8.3%, 5.4%, 10.1% and 8% were current cigarette smokers, former smoker who quit in the ≤ 90 days, 91-365 days, > 365 days, and never smokers, respectively. Compared to other tobacco users, e-cigarette users were less likely to be non-Hispanic Black [OR= .28 (95% CI: .10-.82),] and illicit drug users [OR=.18 (95%CI: .04-.91)], and more likely to be former smokers with the highest odds occurring during the first three months after quitting [OR= 23.47 (95%CI: 7.48-73.61)]. When compared with individuals who never used any tobacco products, e-cigarette users had higher odds of being exposed to secondhand smoke [OR= 6.32 (95%CI: 3.44-11.61)], and alcohol drinkers [OR= 4.19 (95%CI: 1.62-10.79)], and lower odds of being college graduates [OR=.28 (95%CI: .14-.57),], illicit drug users [OR= .04 (95%CI: .01-.26),] and of having a household income >$75,000 [OR= .23(95%CI: .06-.87)].
Conclusions: Most e-Cig users are current cigarette smokers. E-Cig use was noticed among never smokers. Comparing with never smokers, the e-Cig was less frequently used by college graduates, illicit drug users, individuals with higher income and more frequently used by alcohol drinkers and those exposed to second-hand tobacco smoking.