TJ, I was a committed smoker, started early teens (now 43 btw) until I gave up in 2005. Since then I've struggled with weight control, not a chubber you understand, but "stocky" in build. However I believe that I am fitter now than at any point in my life. Where I used to push, I can now grind up in a low gear. Where I used to grind, I can now middle ring for the most part. Don't get me wrong, compared to most of the riding gods on here I am probably striving for mediocrity, but the point is since giving up I am better.
As I said earlier, enjoy the vices. There's plenty time to deal with it in Spring. 🙂