I wouldn't worry too much about black lung (silicosis) studies show it takes repeated exposure over a long period of time to cause damage. If you're really concerned, wear a respirator.
I worked in the foundry industry so I've studied this a bit...
As Proverbs says, all things in moderation. (is that really in the Bible or did I make it up?)
Bluedawg

Last edited by BlueDawg; 03/17/2008 4:20 PM.
Bluedawg

God fearing, Gun toting, Constitution loving extremist.