Before lead was put into gasoline two health studies were conducted by the government, but the relevant industries (including DuPont) had influence over the research. Both studies found leaded gasoline was totally safe. Low and behold it reduced the IQ of an entire generation around 3 points (best estimate).
https://en.wikipedia.org/wiki/Tetraethyllead
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Obviously alcohol isn't as damning as lead, but if funded research can declare lead safe it seems like it could conclude anything.