What are the main causes and risk factors associated with chronic bronchitis?

The main causes and risk factors associated with chronic bronchitis include:

Causes:

1. Smoking: Long-term cigarette smoking is the primary cause of chronic bronchitis.
2. Air pollution: Exposure to pollutants like particulate matter, nitrogen dioxide, and sulfur dioxide.
3. Infections: Recurring respiratory infections, such as bronchitis or pneumonia.
4. Genetics: Family history of chronic bronchitis or COPD.
5. Occupational exposures: Inhaling dust, chemicals, or fumes in the