I lived in a house with lead pipes for 20 years while growing up. Ok, so I guess I mainly drank coke for those 20 years but still. We brushed our teeth, took baths and showers etc.
Never did erm... what was that name??? oh yes, "me" never did ME any harm. ;-)
As for depressed intelligence, I've got Degrees in Physics & Chemistry and Microelectronics plus a 9 year career in Semiconductor design.
Behavioural problems... well yeah maybe :roll:
You shouldn't worry about it, you're 100,000 times more likely to die crossing the road or driving to the shop to buy lead free solder!