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This case is surprisingly complicated, actually. One of the few peer reviewed studies done was conducted by the Radiation and Nuclear Safety Authority in Finland. They concluded that the RF exposure can cause blood vessel walls to shrink, which poses a danger in that some potentially dangerous molecules that would otherwise be deflected could come into contact with brain tissue. This effect would be cumulative with certain molecules, which means that the cumulative effect of speaking on cell phones over many years may pose a danger.
Other peer reviewed studies have been held and usually say that there is no risk, but still suggest not to allow children to use cell phones (which one must admit is somewhat suspicious). Considering how long it took for conclusive proof about smoking to be uncovered as dangerous, I would like to see a lot more study.
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