Welcome to the herd! Like you, I quit smoking shortly before beginning bike commuting. While the two major life events were not intentionally made to coincide with each other, they did mutually reinforce each other. That was about the years ago. Since then I've ridden at least 3000 miles each year and haven't smoked or had any desire to, once I got past the initial couple months of withdrawal.

Good luck keeping up the quitting and the commuting. You'll be so much better off for it... but you already knew that. :-)