Lung Cancer Essay

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may no longer do the work of normal cells and in turn crowd out and destroy the healthy tissue. Most of the victims of cancer die from lung cancer. Many of these cases could have been avoided because it most often occurs in people over the age of 50 with a history of smoking. There are different types of lung cancer involving different parts of the lungs. They have different symptoms and are all treated differently. If the cancer is located in one of the bronchi it can irritate the lining of the bronchus and cause a chronic cough. Otherwise known as "smokers cough". In serious conditions of this cough some might actually cough up blood. If the cancer spreads it may fill up the bronchus so air cannot easily pass in or out. Repeated lung infections and pneumonia are common with this condition. If a tumor is located in the outer part of a lung it may not produce any symptoms until it is fairly large. Finally lung cancer may be carried through by the blood or lymph to circulate through the body and be deposited in other organs. This occurrence is called metastasis. Metastasis has also been known to take cancers from other parts of the body and put it into the lungs. The leading cause of lung cancer is smoking. Cigarette smoke contains more than 4,000 different chemicals, many of which are carcinogens (may cause cancer). The three of the most damaging toxins are nicotine, tars, and carbon monoxide. Second-hand smoke inhaled by both smokers and nonsmokers is another important cause of lung cancer. Smoking is responsible for 90% of lung cancer deaths among men, 79% among women. Also smoking accounts for about 30% of all cancer deaths. Smokers that inhale two or more packs of cigarettes a day, have a cancer mortality rate 12-25 times greater than a nonsmokers. The risk of lung cancer falls dramatically within a couple years if smoking is

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