Lung cancer is the leading cause of cancer-related deaths in both men and women in many countries throughout the world. It is also a major healthcare problem in India. Along with an overall increase in the incidence, we are noticing a rapid increase amongst non-smokers and women. The patients are being seen at younger and younger age group. While smoking continues to be the primary cause, extremely high air pollution levels are a possible contributory factor for exponential rise in the incidence of lung cancer in Non-smoking population.