Trends and sociodemographic factors of e-cigarette use among adult daily smokers in South Korea.

Objective: Previous studies have identified the sociodemographic factors associated with e-cigarette use among adolescents in South Korea. However, literature regarding e-cigarette use among adult smokers remains limited in South Korea.

Methods: Applying four waves (2013-2016) of The Korea National Health and Nutrition Examination Survey (n = 3227), sociodemographic factors were included in the multivariable logistic regression model to study their relationships with e-cigarette use among adult daily smokers.