Kicking the tobacco habbit is quite an accomplishment. Good work.
Keep spending time on the bike. After a while, it sort of becomes it's own addiction. Which is a good thing, imho. I can't get into trainers. Going outside to ride, even in winter is more enjoyable for me. If you find yourself getting bored, unhook that bike and take it out side. As long as it's not icey where you are.