As a somewhat-in-denial marijuana addict that now recognizes the health impact it has had on me over 10+ years of regular use, and have seen lots of people placated by marijuana use I think you are assuming causation where there is only correlation. I'd consider myself somewhat high-functioning, but often wonder at where my mind and body would be today had I taken better care of myself (now that I'm in my 30s).
More to the point though:
> selling bottles of cheap vodka at the grocery store 24/7 is setting up a lot of people who are trying to get clean and recover their lives a lot more difficult.
If a well functioning government is thought of as a securely-running application, outlawing cheap vodka at grocery stores at 2am is like monkey patching. Allowing monkey-patching into production creates vectors for bugs. Allowing the state the outlaw victimless crimes is like allowing monkeyh patching in production.
If the problem is that there are people who are abusing themselves by drinking too much vodka: then using resources to find and help those who need it, and separating the ones who are causing harm to others from everyone else, is going to be a better long term solution.
While the idea of "lets just make it really hard for people to get vodka, then they will drink less.. problem solved!" is great, the reality is that sometimes people will go to great lengths to get their vodka anyway. You just created criminals out of the very people you were trying to help by legislating vodka distribution laws.