Welcome to SR Jaitch
I think we all have a drug of choice - the one thats hardest to let go, that last crutch as you put it - I 'did' many things, and gave them all up pretty easily, including pot, but could never beat my DOC - booze - without support.
You'll find a lot of support here
I've never been but Marijuana Anonymous may be of help if you're already familiar with the 12 steps
Marijuana Anonymous World Services
there's also an online resource
Welcome to MA Online!
Hope to see you around some more
D