Your son is addicted to pot, in your opinion. This means he will use any means to pave the way toward an easy life as an addict. Pot is also demotivating. So a nice room in the basement and loose change is the last thing a pot addict needs. Be very careful. Keep learning. When the family starts recovering in the right way, it can hasten a bottom for the addict. Not always. But it increases the chances.