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Chronic bronchitis is not caused by a virus or bacteria. The main cause of chronic bronchitis is:
1. cigarette smoking.
2. Air pollution.
3. Your work environment may also play a role.
Bronchitis symptoms often happen with other lung diseases, such as:
1. Asthma
2. Pulmonary emphysema
3. Scarring of the lungs (pulmonary fibrosis)
4. Sinusitis
5. Tuberculosis
6. Upper respiratory infections