I just finished grinding my first knife outside with an angle grinder and bench grinder. I noticed a huge pile of steel dust and thought oh crap my lungs. I now know to always wear a mask, but what I wat to know is will about 2 hours of grinding really mess up my lungs, or am I just panicking and over-reacting, thanks. Btw it was 01 tool steel which I think has no vanadium in it but I'm not sure.