I used to smoke it fairly regularly, not because I was into it personally (only actually purchased a bag of weed for myself twice) but my GF and everyone i partied with was, and I'd take it whenever offered just because hey, free drugs, why turn that down?
It did always make me very paranoid and sketchy though. I'd enjoy very low doses, but any more than half a cone would make me really paranoid, I think I was just a lot more sensitive to it than most people.
Had a full blown panic attack on it at one point, it was when I smoked a much larger than normal amount the day after some pills, thought I was dying, the whole nine yards. Eventually passed out, woke up the next day feeling fine.
Around October last year I broke into really bad depression/anxiety/depersonalization, I think much more as a result of my MDMA and meth abuse than the twice a week weed, but weed would set it off (along with caffeine, funnily enough), so I avoided it since.
I've smoked a few times since then. Once at a party in november, had too much, had a pretty bad panic attack. Once again, a miniscule amount in february, made me kind of edgy, but enjoyed it somewhat.
Also went through a phase a month or two ago where I smoked it for a week or so, at first in low quantities (often cooked into food instead of smoking) and actually really enjoyed it for the first time, but after a week or so of daily smoking the old anxiety came back in a bad way and I stopped again. Will be quite happy to never smoke it again, some people just don't mesh well with certain drugs I guess.
I have a family history of mental illness, no full blown psychosis, but my grandfather was a pretty heavy alcoholic, apparently my grandmother (on the other side) was very weird and very paranoid, I'm pretty sure my mum suffers some form of intermitted depression and my brother has severe depression, so along with my own issues with depression/anxiety/depersonalization, I figure it's just not worth gambling with my mental health for a high I only enjoy half the time anyway.