Don't beat yourself up over the smoking. Quitting is hard enough when things are going smooth. Don't smoke around her, and if it comes up admit that you're still working on quitting.
It's good to hear you're on track with your other 180's. (what are they?) I'm sure she is noticing. Be strong.
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl
