My tolerance is through the roof as well due to all the medication I take for my rheumatoid arthritis. Even so, I have a very addictive personality and pills scare the shit out of me.
This puzzles me. If you had a place of your own, with bills and everything you would buy twice as much weed and be broke? I have no idea what your living situation is but it sounds like you have that ass backwards :P I'd be spending twice as much money on weed now if I were you instead of when I move out. But again I don't know if you live with roommates or your parents or whatever.
The thing is I live with the folks, I'm still 19 so moving out is a few years away, I never smoke at home because my parents are always home so this saves me a lot of weed because I can't just go out all the time you know how parents are, they question you.
If I had my own place I wouldn't need to worry about the folks so I'd pretty much be getting ripped whenever so my weed would finish quicker as I would be smoking more, so I'd be wasting more money.