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Tobacco smoke is a key factor in the development and progression of COPD. Exposure to air pollutants in the home and workplace, genetic factors, and respiratory infections also play a role.
Chronic bronchitis is long-term inflammation of the bronchi. It is common among smokers. People with chronic bronchitis tend to get lung infections more easily. They also have episodes of acute bronchitis, when symptoms are worse.
Asthma is a disease that affects your lungs. It is one of the most common long-term diseases of children, but adults can have asthma, too. Asthma causes wheezing, breathlessness, chest tightness, and coughing at night or early in the morning.
Emphysema develops over time and involves the gradual damage of lung tissue, specifically the destruction of the alveoli (tiny air sacs). Gradually, this damage causes the air sacs to rupture and create one big air pocket instead of many small ones.
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