There is no intervening with my MIL. If its any consolation, I went outside and smoked with her and had a great conversation. That's one thing about smokers we get in a lot of good times together when we're ostracized from the rest of the folks. I will also admit that when my MIL comes to my house or rides in my vehicle, I chain smoke.
I certainly sympaythize with that, and thanks for doing the right thing.