There may be concerns with boiling the glass and having the lead vaporise, as well as using objects made with exposed lead glass to eat.
Then again, we are already using a torch, lots of metals in the glass, lots of metals in foil or leaf form, fuming...
I know that pottery glazes can leach lead out into its contents, but I can't see it being a big problem.
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GTT Mirage, GTT Lynx, Smith's Little Torch
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