Cigarette smoking is by far the biggest risk factor for lung cancer, data shows — but in a surprising turn of events, the most common form of the disease is primarily found in non-smokers.

Initial combined cryotherapy and irradiation for unresectable non-small lung cancer. Chest 1992; 102:1436-1440 Walsh DA, Maiwand MO, Nath AR, et al. Bronchoscopic cryotherapy for advanced ...