I quit and now I run 4 miles a day and have not felt better in years. I don’t miss the stinky breath and clothes, and over that past year and a half have saved a ton of money.

All I can say is don’t try to quit unless you really, really want or need to, otherwise you will fail. Just knowing that smoking is bad for you is not really enough (you knew it was bad for you when you started!). You have to have some emotional reason to quit, such as “I hate being an addict” or “I want to be around for my friends and family”. This will sustain you. And use the patch. They rock.