<qa>  What is a chronic progressive disease of the airways and lung parenchyma associatedHead and neck cancers usually occur in patients who have a history of long tobacco use. Chronic obstructive pulmonary disease COPD is a chronic progressive disease of the airways and lung parenchyma that is also associated with exposure to tobacco. COPD and head neck cancer share a common environmental risk factor in cigarette smoke exposure. the investigators hypothesize that patients with chronic lung disease related to smoking have a higher risk to develop cancer in the head and neck. 