[ZeroGravitas]

Did the abuse of alcohol and it's impacts go up or down after prohibition? Probably depends on whether you count making gangsters rich and famous, and people dying from drinking bathtub gin as abuse or not, but even if you exclude all that, it's not a slam dunk that there would be a big shift in either direction for users, or that it wouldn't simply displace other drugs, legal or illegal, which you'd need to measure to get a true picture.