Lung Cancer Screening in a Population Exposed to Occupational Lung Carcinogens

Inclusion Criteria: Subjects at high risk of lung cancer: current smokers smoking 30 pack-years or more or ex-smokers smoking 30 pack-years or more and who have quit smoking for less than 15 years and currently or previously occupationally exposed to lung carcinogens. With an algorithm for determination of minimal duration of exposure to occupational carcinogens (according to the type and duration of occupational lung carcinogens) Exclusion Criteria: * Presence of clinical signs of lung cancer * Subjects with a history of lung cancer * Presence of serious short-term life-threatening comorbidities * Absence of occupational exposure to lung carcinogens according to the predefined criteria * Subjects already included in another prospective cohort study * Subjects already assessed by chest CT scan during the previous year * No tobacco exposure or insufficient tobacco exposure or smoking cessation for more than 15 years.