Does he have mental illness? Was he ever seen by anyone? He sounds severely unwell.

How is he smoking pot if he isn't making money? Do you buy him pot? Is he smoking in the house? Are in you in a state where it's legal? If it's not legal in your state, then you have to protect yourself.

Is he maybe selling pot during the day? How is he affording bear and pot? What's he eating and drinking? Just don't buy enough for him to eat

He needs to seek some help. But to all honesty he only does all this because he can (unless he has an illness of sorts). Before you two met, who supported him? He pays his daughters share of tuition. Where does he get the money for that?