All patients with a smoking history of at least 15 pack years, an minimal age of 50 years and an recent available CT scan are enrolled.
All subjects with a diagnosis of lung cancer are also collected (irrespective of age and smoking behavior).
In addition the investigators collect:
* specific questionnaires (MRC, CCQ and smoking history)
* medical and professional history
* complete pulmonary function (spirometry, bodyplethysmography and diffusing capacity)
* serum, plasma and DNA samples.
In specific subgroups the investigators also collect:
* Peripheral blood mononuclear cells
* Lung tissue - if available - from a surgical procedure (lung transplantation or lobectomy)
