Also, remember, it's not like eating an ounce of lead will poison you.
Yes, kids eating lead paint over many months can be a problem. But there the lead is ingested, and they are kids.
An adult holding solder in his mouth is not a problem.
FWIW, I did this myself for many years from 13-24 without any problems... and I don't recall ever swallowing a single piece of solder.