Hey good news, you're not the first teacher to be a nicotine addict or more specifically one who dips. Matter of fact there is a badass teacher in my quit group who is coming up on day 600 in the next month. Point is ...none of us are alone here and no matter what you do, how long you dipped, or how much you dipped we've all been there. Moreover, many of us (myself included) used a health scare as a springboard to finally cut the cord. Post roll, get involved, and build relationships. Before you know it you'll have built a quit foundation out of new friends and quit brothers who are going through or have gone through the exact same thing you're going through.
Congrats on taking the first step and like those bad ass quitters before me said, post roll, post every day, post early. Lets do this.