Dr. Ronald Herberman, director of the University of Pittsburgh Cancer Institute, told his own faculty to limit their time on cell phones because of a possible risk of brain cancer.
His warning pointed to nonpublished research, which suggests that everyone, but especially children, should limit "long-term cell phone use to possible adverse health effects including cancer."
Children are particularly at risk because their brains are still developing, Herberman said.
The American Cancer Society said that Herberman's warning was too strong, given the lack of scientific evidence, and that if there is a risk, it is very small.
Herberman said that even a small risk is too great for ourselves and especially our children.
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Cell Phone Use and Cancer Resources
To read Dr. Ronald Herberman's complete warning and advice on how to limit exposure to radiation emitted from cell phones, click here.
The National Cancer Institute's Question and Answer Fact Sheet on cell phone use and cancer covers everything from basic questions to explanations on electromagnetic radition.
The Food and Drug Administration has an entire page devoted to this issue: "Cell Phone Facts: Consumer Information on Wireless Phones."