You have pretty much everything hitting the fan long term and short term.

I feel for you I really do, I doubt your going to fix yourself up "quick" enough for them to not notice you quit your job and meds.

I'll be blunt.... you should be honest with them as they are taking care of you, your not homeless nor hungry.

You have lots of addictions going on, Sure no way to fix them all at once. I'm not anti pot , but I would suggest you take the money your using to buy pot and find a new Pdoc and T and be 100% honest with them and start on a treatment plan that is going to help you gain control of your life. Okay things didn't " help" in the past , doesn't mean they will never help.

Even on the right medications and self care .. Bipolar is going to jump up and slap the hell out of you at times,, That's what Bipolar does... But coping skills can be learned and hurdles put in place that will help you see the episodes before they are totally out of control, You will be able to reach out for help sooner which will lessen the amount of damage that can happen.

I hope your Mom is going to be found Cancer free.

Do put some thought into what your going to do one day if you are in this situation and your parents are no longer alive or able to take you in. I'm not being mean or judging, I'm just hoping that you keep fighting the fight and find some balance in your life.