NPR's Jon Hamilton reports on the largest study to date on cell phones and the risk of cancer. Researchers from the National Cancer Institute looked at the risk of brain cancers among people who were regular users of cell-phones for an average of about three years. They found no evidence that regular users had a higher rate of brain cancer - but the scientists say some of the findings are troublesome enough to warrant further research. The study appears in tomorrow's issue of the Journal of the American Medical Association.
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