Body functions off marijuana

Hi!

So my boyfriend is finding that he gets in bad moods/ doesn’t have an appetite without a form of marijuana. Like he will try to not smoke or refrain for a while but then finds himself in shitty moods. He is smoking hemp carts and goes through them fast so $$$, and again he wants to stop but hates the bad moods he gets in. Last year he was getting super sick (throwing up for days) and we thought it had to do with weed, so he quit for 3 months to see & barely had an appetite. We found it was related to anxiety so he’s on meds for that but if anyone has advice or has been through this please lmk!

Thanks :)