You hit the nail on the head.
Now the question is: Should drug use be criminalized? Criminalization leads to the "judge nudge" and to both higher failure rates in effective programs, and to charlatanism in drug "treatment."
Or should we go for putting 20% of the population in prison?
Drug use is not illegal. Drug possession is.
"Or should we go for putting 20% of the population in prison?"
Those 20% are in prison because of drug dealing, not using.