There are healthy cells that grow and assign passim the body to keep it functioning properly, but someti mes this developing gets out of control when the cells continue to produce all the homogeneous though cells arent needed. These abnormal cells in the lungs originate when the lungs are exposed to carcinogens for instance those found in cigarette smoke. At first, only a small number of abnormal cells susceptibility appear, but as these cells are increasingly exposed to carcinogens they will...If you hope to get a full essay, order it on our website: OrderEssay.net
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