What happened when opiates/cocaine went from OTC to RX?

Some back ground:

I remember reading somewhere that much like convenience stores will have smokers lined up outside waiting for it to open so they can get their cigarettes, pharmacies in NYC? before the Harrison act had addicts waiting outside for them to open so they could get their drug of choice for the day. I don’t remember where I read this but I’d be interested in any writings from the time that talk about conditions both before and after and the consequences of cocaine and opiates suddenly being prescription only.