A trigger for bronchitis can happen when a virus, bacteria, or even a particle irritates the bronchial tubes causing an inflammation reaction. Acute Bronchitis can result from a trigger due to: • Virus-like the cold or flu • Bacterial infection • Exposure to any substance that irritates the lungs like smoking, dust, fumes, vapors, and air pollution Chronic bronchitis is the cause of repeated irritation and any damage to the lungs and airway tissues. Some of the most common causes of chronic bronchitis include: • Smoking • Long-term exposure to dust, air pollution, and fumes from the environment • Genetic factors • Continuous acute bronchitis • History of respiratory illnesses or gastroesophageal reflux disease (also known as GERD)