One specific lung disease is chronic obstructive pulmonary disease (COPD). Emphysema, and chronic bronchitis are the most common ones. Many COPD patients have both of these conditions. Emphysema eventually destroys air sacs in the lungs that interfere with the flow of air outwards. Bronchitis tends to cause the bronchial tubes to become inflamed and narrowed, thus allowing mucus to accumulate. Tobacco smoking is the primary cause of COPD. Exposure to chemical irritants for long-terms may result in COPD, too. This is a disorder that usually takes a long time to evolve. Typically, diagnosis requires imaging scans, blood testing and lung function monitoring.    

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