Survivor bias.When a child 8-12yrs old, i smashed loads of asbestas garages that where coming down, we burnt the asbestus so it blew up 80 metres in the air showering us kids with it. Im 51 and have no probs to date, don't worry..
I know people who worked most of their life in this industry and i see them regularly.
http://en.wikipedia.org/wiki/Survivor_bias