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However, there were fewer HTP and/or EC ever users among ever CC smokers who successfully quit smoking. CONCLUSIONS Many adolescents, especially CC and EC users, had already used HTPs shortly after the introduction of HTPs in Korea. The use of newer types of tobacco products is associated with lower odds of abstinence from CCs; therefore, it is important to protect adolescents from them. © Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.BACKGROUND Tobacco 21 (T21) laws, which rais