How is smoking part of your relationship?

My wife and I are both smokers. I don't think we would have met if she was a non-smoker. Before we got married, we discussed a number of things, and our smoking was one of them. We both believe that relationships between smokers and non-smokers is complicated at best. We agreed that we would both be smokers for the rest of our lives, unless one of us has to quit for health reasons. In which case, we would both quit. Albeit, I would probably need professional help.