Judging from your post, you really messed up to be honest.
Personally I think a better option is to see a psychologist, else you aren't going to get out of your old habits, since you promised them you'd quit over and over ( maybe a little over the top, but seriously Marijuana? ).
Though I think sending you away, is only going to cause you to become more addicted to bad stuff.
Personally I understand you're parents wanting you to leave, but it's only going to move the problem, making it probably even worse.
Try and talk to your parents, and try and figure out a way not to break your promises and get rid of all off that bad stuff ( like some help from outside ).
If they don't want that, you can try and deal with the situation in a different state, show them that you can be a 'good' kid, maybe than they will forgive you.
Good Luck!
Personally I think a better option is to see a psychologist, else you aren't going to get out of your old habits, since you promised them you'd quit over and over ( maybe a little over the top, but seriously Marijuana? ).
Though I think sending you away, is only going to cause you to become more addicted to bad stuff.
Personally I understand you're parents wanting you to leave, but it's only going to move the problem, making it probably even worse.
Try and talk to your parents, and try and figure out a way not to break your promises and get rid of all off that bad stuff ( like some help from outside ).
If they don't want that, you can try and deal with the situation in a different state, show them that you can be a 'good' kid, maybe than they will forgive you.
Good Luck!