> Nobody seems to be saying they want unregulated marijuana usage, so it seems comparable

Comparing outlawed, regulated, or unregulated without nuance is unfair. Things can be effectively outlawed, overly regulated, unenforced thereby unregulated, etc. Instead of focusing on the words, we should focus on the effect. To restate my previous claims in terms that hopefully won't be misinterpreted, "Increased regulation/restrictions on smoking has decreased usage significantly."

I'd say the reason it is not comparable is it is adding restrictions instead of removing them. To go from 0 to a set of regulations is one thing, but since that is not the case, the direction matters as much as the result.