Final answer:
Smoking is a major cause of chronic bronchitis, contributing to inflammation and mucus production in the bronchial tubes.
Explanation:
Smoking is indeed a major cause of chronic bronchitis. Chronic bronchitis is a form of COPD characterized by inflammation of the bronchial tubes leading to excessive mucus production. The chemicals in tobacco smoke irritate and damage the lungs, contributing to the development of chronic bronchitis.
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