Shrooms just made me very bubbly and laughy and then they went downhill when I realized I actually had things to do in the morning. It's something I could probably describe in detail in person, but would end up tl;dr in text and/or might get lost in translation (actually I should get back into writing. Maybe that would be a good place to start.)
As for weed, I started fucking up my grades so I wanted to cut it out. But then I tried again recently, and all I said to myself was "well, this is nice, but I don't really need it." And I was very proud of myself for it.
I still drink, but pretty much on weekends only. The long-term effects seem less crippling than those of marijuana (unless I end up with a problem, which - trust me - isn't happening) so I mostly prefer that.