Citation needed.
Drugs are a cultural and spiritual problem. People get high because it is a short-cut to pleasure. We live in a society of short-cuts and pleasure seeking. Legalizing weed won't fix that. The real solution is long, hard, and cultural in nature. That's why no one wants to do it... and people suggest short-cut fixes like legalization...
I will use Colorado as a citation. Are people towards harder drugs enmasse, a few don’t count, or are they generally satisfying themselves with low level, but legal, highs?