Lung cancer has the lowest survival rate of all malignant cancers and is the leading cause of cancer-related deaths in America. Unlike most tumors, which form because of gene mutations or unknown causes, smoking causes most instances of lung cancer. Sometimes, malignant lung tumors may appear even in people exposed to second-hand smoke, who personally never smoked. This cancer affects the air sacks in the lungs and can spread alarmingly quickly. Early treatment is a necessity.
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