Tip #1 - Your Quit Must Be As Important As Anything Else In Your Life
It must be as important to you as working out. It must be as important to you as running 5k races. It must be as important to you as this new guy you just met.
Not more important, but as important. No more, no less.
It must be important enough that, when you get that next coupon in the mail, or the cute clerk at the store asks if there's anything else you'd like, your reply will be "No thanks, I am quit!"
For tips 2 through 25, follow the links in my signature. Get serious, be serious, stay serious, stay quit. It's simple. Not easy, just simple.