So crack didn't exist in 1964, cocaine was not a popular drug in 1964
wasn't til 1965 that amphetamine inhalers were removed from OTC sales. The FDA estimated that there were well over 200 million amphetamine pills in circulation by 1962 in the US, still legal. in 1971, was changed to Schedule II status.
Powder Cocaine was popular by WWI, and stayed that way, despite the Harrison Narcotic Act in 1914. It was seen as a 'safe' illegal drug, unlike Heroin.