Emphysema - The abnormal enlargement of alveoli (air spaces) in the lung, which also causes them to lose elasticity., Asthma - A long-term condition that occurs when the main air passages of the lungs, the bronchial tubes, become inflamed and go into spasm., Bronchitis - An inflammation of the bronchial tubes (the air passage between the trachea and the lungs), which causes a persistent cough and produces a significant amount of phlegm or mucus., Lung Cancer - The uncontrolled growth of abnormal cells in one or both of the lungs.,


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