California is probably the best example going of how not to "legalize" weed. However, this also highlights the primary difference between weed and meth, opiate

California is probably the best example going of how not to "legalize" weed. However, this also highlights the primary difference between weed and meth, opiates: ease of manufacturing. The only other common drugs that come close are things like mushrooms and fermented beverages, and I'd argue both of those are still riskier.