I had a friend that taught with leaded solder and say 'you can wash your hands, but you can't wash your lungs', and considered the fumes from lead-free solder as more exotic and cancerous than burning rosin. Lead free is regulated to prevent the metal from getting into the environment on a large scale, there's not health regulations around what gets burned off when hitting lead-free solder with a soldering gun at the wrong temperature. It's meant to be cooked in an oven with ventilation away from humans.

It probably varies; some people are allegic to rosin, some develop an allergy from long-term exposure, and others seem to effectively be immune to it.

Yeah I grew up with it too. Also the smell of cigarettes and coffee typical of so many communist government offices brings back pleasant memories.

lead-free solder fluxes tho... they are fucking vile stench