Lung cancer is the leading cause of cancer deaths in the United States and worldwide. Approximately 85% of lung cancer occurs in current or former tobacco smokers. Lung cancer forms in the tissues of the lungs, usually in the cells lining air passages. The two most common types are small cell lung cancer and non-small cell lung cancer. Listen in as Doug McCormick, Nurse Practitioner, explains that early detection of lung cancer is key to more successful treatments and better outcomes.