1. Lung size increases.
2. Alveoli are reduced in number, destroyed, darkened.
3. There are black spots on the lungs.
4. The walls of the lungs and alveoli are destroyed.
5. The cilia of the inner wall of the lungs are destroyed.
6. X-ray film of lungs is not completely black and hazy as an impression.
7. Any empty space or emphysema is seen in the lungs.
8. There are secondary growths such as cancer and tumors.