What are the causes and symptoms of lung diseases due to gas or chemical exposure?
Lung disease generates three major symptoms–coughing, wheezing, and shortness of breath. It also predisposes the lungs to infections such as bronchitis and pneumonia. Cancer is a late effect, requiring prolonged exposure to an irritant. In the case of tobacco, an average of a pack of cigarettes a day for forty years, or two packs a day for twenty years, will greatly increase the risk of lung cancer. Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.
