There has been no studies that have been done that have shown that marijuana has an effect on psychosis that have been done properly.

The reason why the use of marijuana can be considered dangerous is for two reasons. The first is that marijuana users generally use other drugs along with marijuana. The second being that street marijuana has been found to include other drugs such as Ketamine and PCP, both of which are dissociatives (a category of hallucinogen that have effects that are similar to psychotic effects).

Marijuana is not relatively addictive in my opinion. Relatively addictive in this context means compared to any drug that might possibly be considered addictive. Some studies have tried to insist on marijuana addiction and physical and mental dependency occurring although these were in patients who had usually been smoking at least once a day for on average 14 years and usually involved about half saying they had withdrawal symptoms, which the majority were "insomnia". Caffeine is far more addictive than marijuana to put this in perspective. Marijuana can be considered as addictive as a kid could be considered addicted to video games, if you take away a video games from a kid who enjoys video games and plays them for about an hour a day the kid is going to be disappointed and want to play again... This is not addiction, I especially want to stress that I disapprove calling marijuana addictive because then it seems like to the majority of people addictive like heroin, meth, cocaine etc...

Street marijuana that has not been laced by anything cannot cause schizophrenia or psychotic effects that last any longer than 3 hours. The chances of it causing psychosis short term psychosis are unbelievably low and the amount needed to be consumed to trigger a short-term psychotic "episode" would be so unbelievably high you would most likely need to be smoking for a full 24 hours and even then it is extremely unlikely.

Should you stop smoking marijuana? Yes I think that you should, even though what I have said prior may influence you otherwise. I think that you should because of your situation. Marijuana can have considerable complications with the medications that you are already on. Marijuana also causes a high feeling, where you feel slightly happier, more calm etc... although this high feeling is almost always followed by a low feeling where you will dip below how you feel on average, usually not by much albeit still lower than average. In most people this slight drop isn't really enough for them to even notice, although in someone with Bi-Polar 1 or 2, major depressive disorder, severe depression etc... this drop has a very good chance of becoming a larger drop because of the psychological factors of the slightly better feeling felt prior. This larger drop can result in things like increased want to die (suicide), increased want to self-harm etc... . These are major things that have to be accounted for when you have a mental illness like the ones just listed above. The last reason I strongly do think you should stop is that if you get marijuana that is laced with something like a hallucinogen or something worse then it will almost definitely effect your other medications and has a very good chance of what would be considered a "bad trip" or a "sketchy trip" to a person without Bi-Polar it almost definitely will result in very serious negative consequences that can result in death.

In-short - Smoking marijuana isn't necessarily bad, nor is it "relatively addictive", it does not cause long-term psychosis, the chance of it causing psychosis by itself are astronomically low. I still think that it is an awful idea to smoke it in your situation because it most likely will cause your mood to go down below average after the "high" effect wears off, it can effect other medications you are on, if it is laced with something it can result in death very easily. The risks far outweigh the rewards, the only logical answer is for you to stop and it shouldn't be very hard because marijuana isn't "relatively addictive".