James Prieger E CIGARETTES AND SMOKING: CORRELATION, CAUSATION, AND SELECTION BIAS Korea closes loophole on synthetic nicotine to curb youth vaping The Korea Times South Korea classifies liquid e cigarettes as tobacco, enforces warnings and fines CHOSUNBIZ 2FIRSTS South Korea's National Assembly Passes Law Classifying E Cigarettes as Tobacco Products with Full Equivalent Regulation 2FIRSTS South Korea Implements Law Requiring Full Disclosure of Tobacco Harmful Substances