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Over the last 10-15 years numerous large scale studies (+500) have been completed to document the possible adverse health risks of mobile radiation. Overall, many of the studies indicate a connection between mobile radiation and adverse side effects.
Watch this clip from "60 Minutes" with brain surgeon and mobile radiation expert Dr. Charlie Teo, who warns "After 10 years' use of mobile phones the risk of developing a brain tumor is at least doubled" (7.39 min).
So far, authorities are reluctant to unambiguously communicate just how dangerous the use of mobile phones really is, even in spite of several hundred different acknowledged studies indicating a clear health hazard. However, the Danish Health authorities do warn about the extended use of mobile phones for more than brief conversation and they do advise against children using mobile phones in general. WHO recommend an overall precautionary principle regarding the use of mobile phones and wireless devices. This is confirmed by many ongoing studies and thus no conclusive evidence of the long term effects of mobile radiation is yet available. However, WHO already has classified mobile radiation as a "potential cause of cancer".
8 good and free pieces of advice on how to avoid mobile radiation