Welcome CMack, you've made a great choice. I endured a cycle of starting, worrying, stopping, failing, and regretting for 32 years. I was fortunate to stumble upon KTC. One day at a time is the way to do this (and to live well in general). My experience was that I could endure and win the raging battle in the early days of quitting. A week or so into a perfectly fine quit and the voice would whisper something like, "well now that you've won, maybe you should treat yourself to a chew; just one of course". And then I would find myself back in my dark, damp, stinky hole. There's something out there that wants me dead but it will settle for me chewing.
Be vigilant, post roll, read what others have to share.
Willy