One thing I always wonder is what are the consequences of all the dust and debris laying around the shop or place where you work after you're done sanding or grinding. Unless you use the vacuum 24/7 and have a few dust collectors that crap isn't going anywhere.

Yes, wearing a mask is extremely important when working your tools but one cannot walk around with a mask all day even when all the dust has settled down. And we're still breathing in that crap, maybe not in the same amount, but nonetheless.

It reminds me of smoking. Although I don't smoke I can still get cancer from breathing in other people's smoke.