Vaping ex-smokers show 56% higher lung cancer risk than complete quitters

A five-year South Korean cohort study of over 4.5 million adult ex-smokers found that daily vape users had a 56% higher incidence of lung cancer than those who quit all nicotine products. The finding challenges the harm-reduction narrative around vaping as a cessation tool, though causality and confounding factors remain uncertain. This could influence public health policy and regulatory approaches to e-cigarettes.