It doesn’t, but how can you justify criminalizing something while keeping something just as bad for society or worse legal? How can you justify the converse? Something already kills 65,000 people per year, and we need another one? Why would we want another one?
I used to hold that opinion...we can't make things worse. But I don't know if you understand my position. I don't know how legally, constitutionally you can ban something while keeping legal something that has historically caused more deaths and harm to society (as far as we know) than the substance we banned.
Why should alcohol users have more right to use their harmful substance than drug users? You'd have to prove that recreational drug use causes substantially more harm to society than alcohol use. And that remains to be seen.