Before you get all bent out of shape there wasn't any sort of conclusive test done that proved the surface lead was leeching in to the juice and then getting vaproized and inhaled. I think the only real test done was by super x and that just confirmed that there was trace amounts of lead on exposed part of the brass. The process brookj recommends was the solution if you are like me/him and like to play it safe. That being said for some it's a non-issue since people buy brass drip tips, attys and all sorts of brass accessories for their vaping stuff.
Edit: Too slow and credit goes mundy
Edit2: Also brass is used in a lot of daily applications (like water pipes) so there is also that to consider.