I highly recommended Reiss' book: We Sell Drugs https://www.amazon.com/We-Sell-Drugs-American-Crossroads/dp/0520280784

Reiss discusses the life and works of Harry J. Aslinger who was the head of the Federal Bureau of Narcotics. The United States spoke out under Aslinger against drug use and worked with groups that saw drugs and drinking as evils but their motive was to actually control the drug supply for wartime pain management.

Aslinger and others around him would push for criminlization of drug use, even in other countries. They discovered that the natives in South America would chew the coca leaves (which would not get them high but provide them with vital nutrients they were not getting elsewhere, as well as being a cultural thing. The US and Aslinger pushed to ban this custom.

The US would then collect the raw product, literally stamp "Made in the US" on it and distribute it to allies for medical use. People who gained these drugs illegally were prosecuted (Aslinger told people to focus on lower-class towns, especially ones with minorities over the white upper-class ones.)

Their use became illegal as medical technology advanced. The high addiction rate and overall effect the drugs had had a large part in their becoming illegal as well.

Hope this has helped. Let me know if you have any further questions.