A landmark retrospective analysis of 4.5 million Korean adults has raised important questions about the long-term safety of electronic cigarettes as a smoking cessation tool. Published in Nature Medicine in June 2026, the nationwide study reveals that individuals who transitioned to e-cigarettes after quitting traditional smoking faced higher lung cancer risks compared to those who achieved complete nicotine cessation.
The research utilized South Korea’s comprehensive national health database to track extended health outcomes across the entire adult population, providing robust evidence on this critical public health question. These findings challenge prevailing assumptions about e-cigarette safety and suggest that while e-cigarettes may serve as a transitional aid, complete nicotine elimination remains the optimal strategy for long-term cancer prevention. The study represents one of the largest population-based analyses examining e-cigarette use patterns after smoking cessation, with implications for revising cessation guidelines globally.
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