I prefer to avoid stimulants as I am already edgy enough, but have experimented with speed, meth, and coke. I still use ecstasy on occassion, but only once in a great while, and mainly for my girlfriend's sake (she has only used three times).
I have done a couple opiates (opium, vicodins, codeine) but am not the opiate type of guy.
I don't do inhalants, though when I was in kindergarten I used to LOVE that model cement.
I do K from time to time and have tried PCP but don't maintain a habit with either. DXM is not for me.
I smoke pot every single day pretty much, though I do take breaks once in awhile when I feel I could use a little head clearing. It is a very functionable habit for me, and helps my ulcer.
I drink, perhaps too much, I'd like to really cut down on it, but my social situation here is mostly centered around drinking on weekends so my friends sort of suck me into it (not like I'm blaming them)
Psychedelics are my favorite drugs. Acid is my all time favorite and I'm around 60 experiences on it now. Mushrooms are great and I've done them a bunch too. I tried 2ct7 once, but didn't find it as enjoyable or useful as acid or shrooms. I'd love to get my hands on mescaline or 2cb.
Pharmies? Well, I've used valium and xanax recreationally but find them inferior to marijuana in high, and with worse side effects. So I tend to avoid them.
Good luck and stay safe everybody!