in recent studies, it has been shown that marijuana is an anti-depressant because of the happy relaxing sensation it gives people when they smoke it.
However, if you smoke it on a regular basis (which i would say would probably be a gram or a half gram a day, right) it can give you withdrawls and make you feel depressed when you stop smoking it.

Because its an anti-depessant, it should be smoked only a little at a time, like a regular anti-depressant medication.

But, there has also beed a study people who smoke marijuana and suffer from depression or other disorders are more likely to be set off when they do not have a drug, and thats not only for marijuana thats for all drugs too.

Marijuana has become dependent on you even though you dont want it to be. You said you suffer from depression and jsut got off anti-depressants, well marijuana has become the depressant for your pills basically.
I suffer from depression, but i dont take meds for it i stopped taking them cuz i thought they made it worse and stick to smoking marijuana, But if you dont want to become dependant on it and stillwant to continue smoking occasionally, i'd go to your doctor and tell him openly that you smoke marijuana ocassionally and are wondering if you should get back on the medication or if you should stop smoking it. The doctor wont tell anyone its private between you and him.

He may tell you to stop though if it messed up your depression..i never told my doctor, but then again i stopped taking the pills for the herb. I'd rather smoke my depression away than use a pill