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tweet by Johann Hari: The core of addiction is not wanting to be present in life, because pour life is too painful a place to be. This is why imposing more pain or punishment on a person with an addiction problem actually makes their addiction worse.
Why would they grow? Black markets appear and grow in the presence of prohibition and in the absence of regulation, not the other way around. For decades there has been no black market in most countries for alcohol and tobacco because it's trivial to buy high quality versions cheaply.
I've never met a drug user that enjoyed interacting with drug dealers.