Drug use is a health problem that is resolved by decriminalization and treatment.

That still leaves some closely related problems:

* black market drug sales

* people who would rather use drugs than do something else with their lives

* a society that fails to present more attractive opportunities (to every person) than using drugs

These problems need their own solutions. Some people think that criminalization is the solution to all of them. That solution has been tried in every extreme, and utterly failed every time.