I don't understand vinyl itself, but I understand having a hobby that you can't really explain to other people. Mine is throwing car batteries into the ocean.
Lead concentrations in offshore waters are ranging from 0.0035 (American Samoa, South Pacific Ocean) to 0.150 pg/L. (Western Mediterranean Sea; Copin-Montegut et al. 1986).
A lead-acid car battery typically contains 16-21 pounds of lead
For comparison: average concentration of 20 mg/kg of soil