Most window installers show signs of chronic lead poisoning as well.
The first 40,000 windows I replaced were almost all early century windows and I know for sure that I was poisoned by lead over a long period of time. On older guys like me who had long term exposure, the lead settles into the bone marrow then releases back into the blood stream during stress and/or illness.
I suffer from pain in my hands and feet from Peripheral Neuropathy and I've always attributed it completely to my diabetes. But, the more I read about chronic lead poisoning, the more questions I have about lead being a contributing factor to my neuropathy. I think I'll have some testing done next time at the doctor.