What precautions do you take against harmful effects of mobile phone?

I don't really take that much of precautions except to say I don't use cell. phones while I'm driving... My first cell. phone was when I was 18, one of those analog bricks... I've been using cell. phone ever since... I'm 37 now so I've been using cell. phones on a regular basis for going on 20 years now... I don't have a tumor growing out of my head or anything... My doctor tells me I'm over weight but I seriously doubt that it's because of my cell. phone usage habbit... My cell. phone rings, I push a button & bring it upto my ear & talk... I've been doing that for 20 years now? If I die someday & they open me up & I'm glowing green, then people can say it's the cell. phone that killed me but till then, I'm not too worried...