How can I get my mother to listen to me?

I posted a question about my breathing problems because of my mothers second hand smoke a couple of days ago. Shortly after I asked that question I had a doctors appointment for an allergy test. The allergy test showed the same things as my breathing test did. Which is that my lungs just cannot handle smoke. When I came back from my second appointment I told my mom the doctor said she has to start smoking outside. She said she figured that’s what would need to be done. So I got really excited thinking finally, after 16 years, I wouldn’t have to deal with her smoke. Well, just today I came out to the living room just as she was lighting a smoke and I told her to go outside. She said she didn’t have to. I told her once again that the doctors said she has to, and she said “I’m psyching myself up for it.” And then I exploded at her, “What is there to psych yourself up for? All you have to do is take your smoking outside.” Then she said its because she would not be able to sit down and relax while having a smoke. So I took one of our kitchen chairs and put it outside and asked her if that was good enough. She started getting angry with me and we had a huge fight. Does she not care that shes slowly killing me? After our fight she went outside for a smoke, but I know she most likely will not keep this up. What do I have to do? The doctor has told her right to her face that its a problem and she still didn’t listen. What do I have to do?? I’m at a loss right now.