Handbook of Pulmonary Diseases - Hardcoverby Beatrice Gunther (Editor) Pulmonary diseases are the disorders that inhibit the lungs and respiratory system from functioning properly. They can be classified into three main types, namely, airway diseases, lung tissue diseases and lung circulation diseases. Smoking is considered as the main cause of pulmonary diseases. Some other causes include infection, radon, asbestos, and other types of air pollution. The most common pulmonary diseases are