What is lung cancer?
Lung cancer is the rapid growth of abnormal cells in the lung. It can start anywhere in the lungs and affect any part of the respiratory system.
Smoking is the greatest risk factor for lung cancer. If you smoke, quitting smoking can, over time, gradually reduce your risk of developing lung cancer. Lung cancer is the leading cause of cancer deaths in both men and women. Fewer than half of the people who develop lung cancer live 1 more year. And only 15% of people who develop lung cancer live for 5 more years. 1
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