Dual Use of E-Cigarettes and Traditional Cigarettes Among Adolescents in Taiwan, 2014-2016.

Introduction: We investigated the use of electronic cigarettes (e-cigarettes) with traditional cigarettes among adolescents during 2014 to 2016 to identify risk factors for using e-cigarettes only, traditional cigarettes only, or both products.

Methods: We used cross-sectional data from the Taiwan Global Youth Tobacco Survey, (conducted over a 3-year period by the Health Promotion Administration, Ministry of Health and Welfare, Taiwan), which is representative of tobacco use among adolescents aged 12-18 years. The outcome variable was smoking behavior. Dependent variables included gender, grade, monthly income/allowance, parents' educational level, parents' smoking status, close friends' smoking status, use of other tobacco products, contact with cigarette/e-cigarette advertisements, and access to free cigarettes/e-cigarettes. Multinomial regression identify factors influencing the smoking behaviors of adolescents, as manifested in the use of traditional cigarettes only, e-cigarettes only, e-cigarettes with traditional cigarettes, and nonsmoking.

Results: When weighted to the population, the sample included 1723150 adolescents in 2014, 1691568 adolescents in 2015, and 1627216 adolescents in 2016. The rates averaged over three years were as follows: nonsmoking (91.6%), traditional cigarettes only (5.4%), e-cigarettes only (1.5%), and dual usage (1.6%). Among adolescents in Taiwan, the following were risk factors for dual use: male, older, high monthly allowance, smoking parents, smoking friends, use of other tobacco products, contact with cigarette advertisements, and access to free cigarettes.

Conclusions: Our results revealed an increase in the number of adolescents using e-cigarettes with traditional cigarettes. We recommend that the government continue smoking cessation programs while maintaining control over advertisements and promotions for tobacco products.

Implications: This is the first study to examine the dual use of e-cigarettes and traditional cigarettes among adolescents in Taiwan. This study identified the risk factors of using traditional cigarettes only, using e-cigarettes only, and the dual use of e-cigarettes and traditional cigarettes, with nonsmokers used as a reference group. This study examined the relationship between exposure to cigarette promotions and the use of various tobacco products including the dual use of e-cigarettes and traditional cigarettes, both of which have been disregarded in previous studies.