Young women in their 40s who have never smoked are increasingly being diagnosed with lung cancer, with doctors attributing the rise to environmental factors such as air pollution, toxic fumes from cooking and cleaning, aerosols, radon gas and asbestos exposure. National screening programs currently target smokers over 50, leading to late diagnoses in non-smoking women, though advocates are pushing for expanded screening. Targeted therapies are now helping some patients live longer despite late-stage diagnoses.