As a meta-commentary on this category of issues, I tend to be against these sort of substance bans (PEDs[1] in sports is another timely example), and I often see that people who support such measures tend to talk about what things would be like if these substances were completely gotten rid of[2]. To me, this is complete fantasy because there's never been a substance ban that has been very effective at reducing usage…
"Proposition 843 will raise the price of cocaine and heroine and make possession illegal so as to create a massive demand for it among a newly expanded criminal class. We'd like to ensure that the price is so high that the enforcement agencies are outspent and outsmarted at every turn by extremely well-funded drug cartels. We will pay the additional enforcement costs through increased taxes and seizure of private property and assets. Additionally, we plan to make selling these drugs so lucrative that it becomes one of very few attractive career options for our nation's poor."