Are you aware of the Dangers of cell phone usage?

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Since cell phones are a recent development(not older than 20yrs) we are yet to know of their long term health hazards. Much research work is done to study about the effects of radiation, but i think we will know only with time. But by that time it maybe too late.Its already known that over exposure to cellphone radiation is harmful.What they may lead to ,we must wait and see. As "Prevention is better than cure", dont you think that we must be more careful and control the use of cellphones?