In the case of asthma, the airways mucosal lining becomes very thick and muscles contract in an effort to push out the bad stuff. However, prolonged exposure to pollutants in the air can make this a dangerous game, as airways become tightened and oxygen delivery is greatly reduced.
Risk Factors
1. Smoking
2. Stress
3. Pollution
Symptoms
1. Shortness of breath on exertion
2. Prolonged cough
3. Recurrent lung infections
4. Chest pain
5. Other respiratory symptoms