I'm no doctor, but if you've only done a few hours of this and you're 20+ it's probably no big deal. However, you are breathing lead vapor and it's not good for you (if you're at 100s of hours and 12yo that's really not good). If it gets on things you eat, it's also bad. The effects are permanent.
We had leaded (Ethyl) gasoline in cars which was banned 25 years ago and that had noticeable statistical effects on IQ an emotional regulation (violence) for more than a generation.
We had leaded (Ethyl) gasoline in cars which was banned 25 years ago and that had noticeable statistical effects on IQ an emotional regulation (violence) for more than a generation.