text: The most potent<unk> <unk> in the development of<unk>  nodule includes tobacco smoking, pack-years of smoking, age, occupational exposure to carcinogenic agents, previous history of lung cancer, family history of lung cancer, and comorbid chronic lung disease.
option_0: Pulmonary nodule risk Factors
option_1: Occupational lung disease risk factors
option_2: Chronic bronchitis risk factors
option_3: Pulmonary nodule X-Ray Findings
option_4: Pneumoconiosis risk factors
option_5: Adenocarcinoma of the lung risk factors
option_6: Lung abscess risk factors
option_7: Bronchiolitis risk factors