I think it's worthy to note that lead comes from the ground and eventually returns to it.
Tiny traces of "lead" weren't a health issue before electronic instruments capable of measuring it in minute levels were developed and the always frightened nanny "State of California" immediately went stoopid nuts about it (and remains so today).
If the thought of touching anything lead frightens you remember that many gunshot victims carry bullets buried deep inside for many decades with NO medical harm coming from the lead itself!
Bottomline, cast in a moderately well ventilated space (a howling wind is not necessary) and stay clean. Meaning we don't need to sit in front of an industrial exhaust fan while casting; then don't pick our nose, don't eat barehanded and don't lick the gray off our grungy fingers after working with solid lead and all will be well.