• Jinyoung Kim and Sungkyu Lee.
• Southern Gyeonggi Regional Smoking Cessation Centre, Hallym University, Anyang, Republic of Korea.
• J Psychoactive Drugs. 2020 Jan 1; 52 (1): 20-26.

AbstractThe aim of this study was to identify whether or not the dual users of conventional cigarettes and e-cigs were naturally reducing the amount of their cigarette smoking while they were using e-cigs, and whether their urine cotinine level became similar or less compared to conventional cigarette-only smokers. We used data from the Korean National Health and Nutrition Examination Survey (KNHANES), a nationally representative sample collected in 2014-2016. We selected 2,442 participants who were over 19 years old and were current users of conventional cigarettes and e-cigs. Among the total sample, 12.8% were dual users of e-cigs and conventional cigarettes. Conventional cigarette-only users smoked 14.26 (±23.19) cigarettes a day, while dual users of electronic and conventional cigarettes smoked 14.46 (±7.88) cigarettes a day (p < .001). Means of urine cotinine level in conventional cigarette-only users and dual users were 1250.35 ng/mL (±832.75) and 1364.95 ng/mL (±827.96), respectively (p < .001). The result of a multiple linear regression analysis identified that dual users' cotinine level was 136.80 ng/mL higher, compared to conventional cigarette smokers' one (p = .011). Unlike the argument that e-cigs can be used as a smoking cessation aid, we found that using e-cigs might be less likely to support quitting smoking or reducing cigarette consumption.

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