Weed can both decrease or increase depression and feelings of paranoia. It way depends on the individual and the setting the individual is in. Ask your shrink what he thinks about the effects of medical MJ on your type of depression -- he's most apt to give you a more accurate diagnosis than I can.

I too suffer from deression, so I went on Zoloft a few years ago. And I still smoke. The Zoloft makes me not want to kill myself anymore, and life became bearable, but it kind of flattens you're emotions -- not always a good thing, especially all the time. Yet I've not been tempted to stop taking it. MJ alone did not stop my depression as I had been smoking long before then. Don't know how old you are, but they say MJ can cause depression in men reaching middle age (me), but don't think that was my prob. Will never know for sure.

In a pinch, you can always try stopping smoking and see how you feel. I usually start again. Guess I'm a wimp and can't face life sober.

Reality sucks -- oh god ... am now so depressed (only joking).