Lung cancer isn't just a smoker's disease: Doctor explains how air pollution, genetics, and everyday exposures may quietly increase your risk

For years, lung cancer has carried one overwhelming assumption: it happens only to people who smoke. That belief has become so deeply rooted that many non-smokers ignore persistent symptoms, believing they are "not at risk." Doctors say that mindset needs to change.Across the world, specialists are seeing more cases of lung cancer in people who have never touched a cigarette. While smoking continues to be the biggest risk factor, it is no longer the only one that deserves attention. The air people breathe, the places where they work, their family history, and even invisible changes in their genes can all influence the likelihood of developing the disease.As environmental pollution continues to rise in many cities and scientific research uncovers more about how cancers develop, understanding lung cancer has become far more complex than simply asking whether someone smokes.