Yes, it made toxic vapors. If you were doing small batches then maybe not much damage was done, or if the room/house was big and drafty.
Really you need to be outside or someplace well ventilated. I've also seen videos of guys making their own fume hoods to pull the fumes out using AC ducting or clothes dryer vent tubing and a fan.
A lot of guys work in a garage, if they have one, with the garage door open and a fan. A barn or shed where you could leave the door open and have a fan would be good too.
Outside, make sure there is 0 precipitation. Hot lead and water don't play well together at all.