That was in 1937, and they didn't forget. The AMA testified strongly against the criminalization of marijuana, which up until then, was about as common as aspirin is now in the pharmacy, and for much the same reason. When the vote came up in congress, the AMA testimony was not reported before the vote--just Anslinger's diarretic stream of made-up nonsense about how marijuana inspired minority citizens to rape white women.
"...just Anslinger's diarretic stream of made-up nonsense about how marijuana inspired minority citizens to rape white women."
Another dark time in our society.