I would echo Matt's concern. I would think that all the lead shot used in busting the clays would be much more damaging and harmful in the long run.
Its a bit ironic, I think, that they make duck hunters use non-toxic shot because, I believe, that the ducks will eat the shot later and that is what causes the problem of lead poisoning. But yet we hunt doves around the same body of water, or shoot clays, or hunt pheasants in the same stubble field we hunt geese over in the afternoon and we can use all the lead we want.
