I might have you beat. My grandfather was a dentist. He used to give us mercury which we duly abused as most kids who got their hands on it. I have you beat because in the basement of our my childhood victorian house was an old coal burning boiler ( not in use for many years) covered in this white flakey stuff. When we couldn't find anymore stray pieces of coal to throw, my brother and I used to break off chunks and throw the white stuff at each other. Yup, asbestos. Between the mercury and that I figure I'm doomed. So far so good. We also rode bikes without helmets and made our own skateboards when kneepads were only worn by wrestlers.