what causes lung disease
Description. Lung disease refers to any disease or disorder in which the lungs do not function properly. Lung disease is the third leading killer in the United States, responsible for one in seven deaths, and is the leading cause of death among infants under the age of one.escription. Lung disease refers to any disease or disorder in which the lungs do not function properly. Lung disease is the third leading killer in the United States, responsible for one in seven deaths, and is the leading cause of death among infants under the age of one.