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Agree 100%,I try not to worry about such things,the mercury in my tooth fillings do's lay heavy on my mind at times tho.
The fact that there are more cancer causing nitrates in a 6 pack of beer...

Bar be qued beef causes cancer.

What I have done with lead is to burnish it instead of sanding,scrape it with a single edge razor blade to size, than smooth it with a hard pce of steel.