Hope your alright.. but all this wont stop until he wants to quit cannabis.. i was having it up until i was 19.. and i hated the stuff in the end..it ruined my education at school, and i still regret it now. And im 36 now.
Id sit him down and ask him does he want to quit? If he does.. then great. And theres lots of ways how to.. Id explain how i did it, but its long and i dont want to type it all out now if he doesnt.
If he doesnt.. then you have one decision to make.. stay with him.. take the shit and financial crap… or leave and start a fresh and have some money for you and your son and eventually meet someone who will make you happy.
If he is not willing to try his best to stop, do you really want to keep putting up with this.??