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Study finds that processed meat causes cancer, but how big is the risk?

Eating processed meats such as hot dogs, sausages, ham and bacon can cause colorectal cancer, says the World Health Organization. While the cancer risk in most cases is slight, it does increase with the amount of processed meats consumed, according to the WHO's investigation. William Brangham learns more from Dr. Jonathan Schoenfeld of Harvard Medical School. View the Full Story/Transcript: http://www.pbs.org/newshour/bb/study-...