What is the major cause of chronic bronchitis?
A) Smoking
B) Infection
C) Air pollution
D) Family history

Question

Quizplus · Accepted Answer

Smoking is the most common and major cause of chronic bronchitis. Cigarette smoke damages the cilia lining the bronchial tubes, leading to inflammation and an increase in mucus production, which can cause chronic bronchitis. Other factors such as air pollution and infection can exacerbate chronic bronchitis, but cigarette smoking is the most significant risk factor. Family history may also play a role in the development of chronic bronchitis, but it is not a major cause.

What Is the Major Cause of Chronic Bronchitis