Smoking

When I was diagnosed with Type 2 last year, I gave up smoking almost straight away and stayed that way for about 8 months. I then met a girl who smokes and we live together. As you can imagine, I have found it very difficult to not smoke and have on occassions started smoking (mostly at the weekends). I'm very disappointed with myself and I have discussed it with my gf and she says she will give up but it's not materialised yet. I don't want to stop the relationship, but I find it really really difficult not to smoke when she's around. She works in a very stressful job and I don't really think she'll stop any time soon. Any thoughts that people may have would be appreciated!

Cheers,

Max