Almost nine out of 10 cases of lung cancer are caused by tobacco smoke. The longer a person smokes and the more he or she smokes, the greater the risk for lung cancer. People who breathe secondhand smoke are also at a higher risk for lung cancer.Lung cancer is often hard to detect in its beginning stages. This type of cancer often spreads to other parts of the body before it causes any symptoms, so researchers have worked for years to develop reliable screening tests to detect lung cancer early. Talk to your doctor about screening options.The best way to improve your lung health is to stop smoking. Centegra’s Freedom from Smoking program provides group support, behavior modification and nicotine replacement products. For more information, call 877-CENTEGRA.