Help my girlfriend to quit-

Hello all, I am new here. I am a non smoker who is trying to help my girlfriend. I love her dearly and want to help her quit smoking. She has been smoking for 20 years now and smokes between 2-3 packs a day. She also has a bad smokers cough which concerns me greatly.When I first met her I did not know she smoked as I met her online. On the first date I found out but since we were hitting it off so well I decided to continue to see her and see where it went. I have always been anti smoking and have never smoked myself. I normally do not date smokers but there was something very special about her and we seemed to connect like nobody else I have been with. I realize that by being with her I should accept her for who she is but I also do not want her to slowly kill herself. Especially since I love her so much and wish to be with her for the long term. We have even talked about possibly having a child one day so this really does concern me.It took a while to really see how bad of a problem she has. She gets up at 4am and lights up right away smoking 4-5 cigs before she even gets ready for work. This continues all day until she goes to bed. She is a chain smoker, smoking every chance she gets.I have of course talked to her about this and we have had several discussions. In the beginning they went well, with her admitting that smoking is not good but she told me that she absolutely loves to smoke and that she has never had any real plans on quitting. As time went on and my concerns continued she realized this was a big issue for me. She tried to get me to accept it, that this was how she is and even though I do not like it I need to accept her for who she is. Recently the discussions have gotten worse with her getting frustrated with me "pushing her." I really do not like to be around her chain smoking all the time, especially with the second hand smoke and the way it makes me and her smell. She gets ashes all over herself and anything around her. I have tried to be as nice as possible but this is becoming a real problem between us. Other than this, we seem to get alone great. We connect on so many levels and we seem to love each other very much. But it seems the smoking is driving a wedge between us and I am really worried about it. The main reason for the problems, in my opinion, right now is not the simple fact that she is smoking herself to death,Herbal cigarettes, but that her entire life revolves around the cigarette. I have found out that everything in her life has to revolve around her habit. She does not smoke indoors which I am glad, but with that poses problem #1 for me. All she wants to do is stay outside on the deck smoking and talking. In the beginning that was fine but now that is all we do. At my place or hers, it's outside smoking, drinking on the weekends and just talking. I told her I don't mind it, especially when the weather is nice, but I also would like to go indoors too and sit on the couch, maybe watch a movie, some TV, eat on the dinning room table, etc. Second problem is she insists that we take her car everywhere as that way she can smoke in it. I do not allow her to smoke in my car. If I ever want to take my car she gets upset and irritable as that would mean she could not smoke until we arrived at our destination. The times I take my car she would anxiously have cigarette and lighter in hand to light up the second we get out of the car! Thirdly when we do go out. we have to constantly stop and have a smoke break. The minute we exit a store or restuarant she lights up and we are always having to stop what we are doing to get a break. This is very hard, especially when someone smokes this much. I told her that these things are causing a problem in our relationship and that I am very concerned for her health. I am also very concerned with mine as I do not like to inhale the smoke. She has this really bad cough too which just upsets me every time I hear it. Not to mention the amount of money she spends on cigarettes alone,stop smoking, but that is besides the point here.I really do love this girl and want to help her. I simply do not think I can accept a smoker for a life partner. I have told her this and she says that she will possibly try to quit when the time is right, but I need to understand that she may never quit. She did say that even thought she loves to smoke and does not want to quit at this time, that deep down she does want to quit when she is content in her life. I told her that she may never feel that content and that she really does need to quit sooner than later. She feels I have been too pushy and maybe I have lately. Her worry is that every time she lights up she'll wonder if I am going to give her the 3rd degree about it, which is causing her undo stress. I do understand what she is feeling, but truth be known I do get upset every time I see her light up one after another and especially when I hear that hacking cough of hers. I try not to say anything. But of course the subject does come up sometimes and we have had a few heated discussions about it. Recently during one, she confessed that she really does want to quit but she does not know if she can. She thinks it may be too late and that she may never be able to quit. She also has been going through a lot of stress, especially at work where she is applying for a job. She said that she would really appreciate it if I laid off until she gets the job and that there is no way she could would even start to think about quitting at this time. I agreed to lay off until then and that we would talk about it after that time. It is already getting to the point where when all she wants to do is sit outside and chain smoke I tell her I am going inside for a bit. She gets upset as she wants to spend time with me but she is unwilling to take a "break" from her smoke-a-thon to come inside and spend some time with me. I am getting frustrated and I don't know what to do. As a side note I do want to say that she claims I have put the bug in her ear and that she will see about possibly doing something about it sometime soon. The last couple of times we have gone out she has gone a couple of hours without needing to take a smoke break and has pointed it out to me which is a good start. But I still do have concerns with her taking the next step. Even though I don't really know how it is, I am realizing this will be a hard thing for her. And I want to do what I can to help her.She suggested I do some reasearch online to see if there is anything I can read which can help me support someone with this problem, instead of pushing them and trying to tell them how bad smkoking is, etc. Thus the reason I am here. What can I do to help her? I really want her to quit smoking as she is slowly and surely killing herself. I would like her to be around for a long time. I don't want this to be the reason we break up.Thanks for all the help.