text: The most important risk factor in the development of<unk>  cell carcinoma of the lung is cigarette smoking. Other common risk factors in the development of<unk>  cell carcinoma of the lung are family history of lung cancer, high levels of air pollution, radiation therapy to the chest, radon gas, asbestos, occupational exposure to chemical carcinogens, and previous history of lung disease.
option_0: Large cell carcinoma of the lung risk factors
option_1: Sarcomatoid carcinoma of the lung risk factors
option_2: Squamous cell carcinoma of the lung risk factors
option_3: Adenocarcinoma of the lung risk factors
option_4: Occupational lung disease other imaging findings
option_5: Non small cell lung cancer other diagnostic studies
option_6: Squamous cell carcinoma of the lung other diagnostic studies
option_7: Multiple pulmonary nodules causes