Yes, massively, often to zero.
Criminalizing drugs has never been the right strategy to dealing with drugs as a social problem. Rehabilitation efforts have always been much more sensible.
Look at alcohol. It's perfectly legal, but we regulate its manufacture and consumption (the latter of which we might overregulate) and if it's involved in your criminal behavior you may get court-assigned AA or other drug treatment classes.
That should largely be how we deal with most non-violent drugs. People tend to use drugs because they're self-medicating for a psychological problem, or are miserable or damaged, or just get sucked up into curiosity. None of those things are helped by throwing people into a concrete box.