I would think that it actually will have an interesting effect in the long run. You know you are being exposed to a potentially hazardous substance, and thus assume the risks. If you knowingly assume the risk, it would make it harder to sue your employeer, wouldn't it?

Other than slips, falls, and spinning machine parts disintigrating for what ever reason, I think that will cut into workman's comp payouts. For better or for worse.