I decided to quit for lots of reasons. Step one while hungover on a Monday morning was to say to myself, "You've had your last drink." But Friday night I got drunk. Saturday morning I said to myself, "If you drink again, you have to get professional help." That did it. Facing the expense, embarrassment, hassle, meetings, etc. made me keep that promise to myself. I smoked my last weed a couple weeks after that too. It was 13 years ago.