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Every year, about a million Americans are diagnosed with cancer. This means that about 75 mill on Americans now living will eventually have cancer, and one in five will die of the disease. There are many kinds of cancers and many causes, such as smoking, overexposure to ultraviolet rays, a high-fat and low-fiber diet, and some workplace chemicals. Hundreds of millions of dollars are spent each year on searching for treatments, yet far less money is spent on prevention. Should we devote more
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