COPD is due to prolonged contact with chemicals (3), specially cigarette (4), causing devastation of the tiny airways and lung parenchyma through chronic irritation (5) and other systems just like the increased variety of goblet cells, hyperplasia of mucoid glands and fibrosis (6)
COPD is due to prolonged contact with chemicals (3), specially cigarette (4), causing devastation of the tiny airways and lung parenchyma through chronic irritation (5) and other systems just like…