In children, exposure is responsible for an annual loss of some 765 million IQ points in children globally. Low-level lead poisoning is a risk factor for adults, which can result in chronic kidney failure, hypertension, and cardiovascular disease. Lead accounted for 5.5 million deaths annually from cardiovascular disease.
Some lesser known sources of lead exposure.
Gunfire (sounds like a joke, but when you fire a gun it puts lead particles in the air like second hand smoke)
eggs (especially backyard eggs)
bone broth
wild game (because of you guessed it, the lead bullets that killed them)
I believe those are lessesr known because they contain such insignificant quantities, unless your backyard soil is heavily contaminated.