A 1926 health report stated falsely that lead in gas exposure risk was "associated with every day exposure by drivers, automobile attendants, gas station operators, and found that it was minimal. The researchers had indeed found lead residues in dusty corners of garages. In addition, all the drivers tested showed trace amounts of lead in their blood. But a low level of lead could be tolerated, the scientists announced." There's this article, though: https://www.wired.com/2013/01/looney-gas-and-lead-poisoning-a-short-sad-history/

That states that the risk wasn't well-known to the public. Which is weird on examination, don't you think? That such a well-known toxin was ignored and put up with by those who'd be most affected? Almost as if anyone speaking up against it were quickly silenced. I think you're just arguing about what is and isn't a conspiracy at this point. "If it's false, it's a conspiracy, if it's true, it obviously was never a conspiracy." Nah, fam, it doesn't work like that. If someone is considered crazy because they think a certain truth is actually true, they're not usually recorded by history.

I'm really not sure if you're trying to argue against like... the crazy "the moon landing was a hoax" conspiracy theorists or if you legit don't believe conspiracies happen. If it's the former, sure, whatever. But if it's the latter, you're a fucking idiot.