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CONCLUSIONS numerous teenagers, especially CC and EC users, had already utilized HTPs shortly after the development of HTPs in Korea. Making use of newer forms of tobacco products is associated with lower odds of abstinence from CCs; therefore, it is vital to protect teenagers from them. © Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.BACKGROUND Tobacco 21 (T21) regulations, which enhance the minimal appropriate age purchas