First, it is not a habit. What you are dealing with is an addiction. Can you say that you are an addict? Do you want this more than anything else?
Second read the Welcome Center. This will tell you how and why this site works.
Third post roll. Every day we make a promise not only to each other but to ourselves. this site works because of the accountability.
Fourth keep that shit out of your mouth no matter what it takes. Nicotine is the real enemy here so make sure not to ingest nicotine in any form for today. We quit one day at a time because we can control today. Tomorrow is just a dream, today you can choose to be quit.
It really is that simple, it is hard but very very simple. Get some numbers, get some gum, candy, sunflower seeds, fake chew, etc.