I smoke weed on occasion, so I can only tell my experience.
Sometimes it causes increased anxiety and especially racing thoughts. That's the worst!!
However, sometimes is just makes me very happy, very optimistic and helps me understand stressful situations better. I really enjoy this, and this is what usually happens.
It almost ALWAYS makes me super talkative. Something nobody but my husband would enjoy.

As far as a treatment? --- No. Not at all.
It could never help me the way my meds do. Weed is a fallback. A fallback that for me, could go either way.

If it goes the wrong way, say something stressfull happens, I have to fight to keep myself collected. The fight is hard, draining, and can cause bad anxiety attacks.

If it goes in the right direction, it's only good to be temporary because if I smoked it throughout the day as treatment, it would most certainly throw me into a mania.

So, my views on weed is smoke it responsibly. Don't push your limits and pay close attention to how your mind reacts to it. And don't rely on it to fix any problems, for example...MH.

I personally don't recommend smoking more than once a day. I also feel that smoking alone or with someone you trust is extremely important when dealing with a mental illness. If you are surrounded by others, or out and about... You have an extremely higher chance of having anxiety and stressfull situations. ---This is only MY opinion.
I ONLY smoke at night with my husband. If anyone is over I will not smoke. My rules for being responsible for myself.