Smoking in the office

My question is I was working in a small office in where the owner chain smoked in her office. I got very sick and was under a Dr. care last week. I was told this week, that everyone in the office was informed that I would not be returning. I think that I got fired. When I confronted them, I was told that we would talk when I feel better. I told them if they were letting me go, to put it in writing, which they never did. Being that the law is a smoke free working environment, is there any way I can go after them for anything? I was asked by 3 different Drs if I smoked and I said no. It never occured to me that the second hand smoke could be even worse of a danger. I would at least like my medical expenses paid. Is this worth pursuing?