Healthy Young Non-Smokers Are Getting Lung Cancer—Researchers Have a Theory

Theory Briefing

• Lung cancer is appearing in young, healthy non-smokers — a pattern that defies the long-standing assumption that smoking is the near-universal cause.
• Researchers are pointing to pesticide exposure as a possible culprit, a theory that complicates the clean image of plant-based diets.
• Scientists stress that the benefits of eating more plants remain well established, meaning the pesticide risk, if real, must be weighed against known dietary gains.
• The emerging theory suggests environmental or dietary exposures — not lifestyle choices like smoking — may trigger lung cancer in ways not yet fully understood.