Big John writes:

Of course we never worried about the lead (TEL) in the gas (lots in
the high octane fuel) and inhaling it when lighting the tobacco (
Probably part of the cause of my lung problems today.

Tetraethyl lead wouldn't cause lung disease so much as systemic lead
poisoning, but it's debatable whether or not you ingested enough to be at
risk. Much more dangerous is the practice of smoking itself, enough that it
probably eclipses the risk from inhaling tiny amounts of lead.