There are healthy cells that grow and assign end-to-end the body to keep it functioning properly, but sometimes this ha rvest-tide gets out of control when the cells continue to produce all the resembling 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 vital force appear, but as these cells are increasingly exposed to carcinogens they will...If you trust to get a full essay, order it on our website: OrderEssay.net
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