I think you're wrong. The market isn't magic, it needs supply to meet demand and there is a steady supply of drugs to fulfill the demands because of state intervention in the market. The CIA isn't the only government entity that uses the drug trade to raise illicit funds for off-the-books jobs, it's just the biggest. If it weren't for bad state actors, the war on drugs probably would have worked to a large extent; maybe not eliminate the drug trade completely, but at least reduce the volume of trade substantially.