[provemewrong]

Me too. Besides what you mentioned, I'm particularly fond of /r/mdma, /r/psychonaut and /r/rationalpsychonaut (for discussions about psychedelics sans spirituality and religion). Also /r/nootropics. And /r/drugs in general. Don't forget /r/trees, which is of course the gateway subreddit, but it's rather boring in comparison.

[draw_down]

Trees is just a bunch of people posting their bowls and where they toked up on a hike. A lot of them likely live in legalized states. I'd say not even close. (The "gateway" thing was a nice touch though.)

[Grangar]

/r/cocaine is another pretty decent one. Mostly people posting pics of lines but there's the occasional announcement of quitting where people get really supportive