“So in the world you inhabit the war on drugs actually increases drug use.”
I did not say it increased drug use, but that it exacerbates the negative effects. It turns drugs into expensive commodities, which encourages illegal behavior by drug users to get money to obtain those expensive commodities. The profits from those commodities fund the activities of criminal gangs, which engage in all sorts of other criminal and antisocial behavior. Drug users are also funneled into the criminal world and penal system, which just encourage them to engage in other kinds of crimes as well. All of those things result from the War on Drugs.
I wasn’t discussing the monetary effects of prohibition.