For one thing Urine isn't a heavy metal that accumulates cumulatively in your bones - that analogy is just awful. I don't think you can definitively state that

For one thing Urine isn't a heavy metal that accumulates cumulatively in your bones - that analogy is just awful. I don't think you can definitively state that aircraft pilots aren't having health issues due to AvGas exposure, I can't really find any studies about it but one of the more common health side effects of lead exposure is actually a predisposition to heart attacks due to how lead messes with your blood streams.