Controversial: There is very little evidence that cell phone usage causes brain tumors. At least one large study in (i think) sweden suggested a slight increase in the frequency of tumors or the 8th (acoustic) nerve in high-use individuals, but showed no increase in other types of brain tumors, including gliomas. Other studies have not even supported that there are more 8th nerve tumors from cell phones.
Answered 8/11/2013
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