I never met a top flight bodyman/painter that wasnt an addict or alcoholic. Most of the old timers did it for years without proper ventilation equipment. It would be like sniffing glue for 10-20 years. The mind tends to wander off after block sanding the same car 10 times. Cant smell from the bondo dust and fumes, cant hear from the air hammer, cant see from welding without a shield, and cant think straight from the paint fumes and chemicals absorbing into the skin. Most of the best from the fifties died of lead poisoning. I won an award from Dupont but Ill be dammed if I can remember where I put it......