> The problem with leaded gas in cars is that there were just so many cars out there burning the stuff. Duration of exposure and amount of exposure both matter.

> The problem with leaded gas in cars is that there were just so many cars out there burning the stuff. Duration of exposure and amount of exposure both matter. The difference is not the amount of cars, but that the temperature and pressure in car engines makes lead vaporise, so it can be breathed in. A soldering iron doesn't reach those temperatures (vaporising the lead is the opposite of what you want when soldering).