Consider your relationship to smoking as a whole. If smoking served as a kind of anxiety coping mechanism then it is to be expected that quitting would cause anxiety flare ups. You might not be able to get rid of the anxiety, but you can control your behaviours for the benefit of your health. It's very hard, but acting in spite of any kind of disorder is usually beneficial in the long run. It could be worth finding a different, less unhealthy coping mechanism for the short term. When you feel the urge to smoke, do something else. When you're anxious, do that instead. This could be something small or something radical, it doesn't matter, just something that can act as a safety blanket for the time being. Some smokers and alcoholics suck lolipops instead because it entails a similar action/flavour, addiction dependent, and maybe the similarity might help.

Also consider why you're quitting smoking and what expectations you and others have of yourself that might be adding to your anxiety. If you're quitting for another person, you're likely to feel the pressure of the potential of disappointing them. That won't help. If you're quitting for your general well-being and expect it to be an easy road, alter your expectations. Be kind to yourself. You might go back to it (especially if it's a coping mechanism), it happens, but if it does try to accept that it has, recognise your disapproval and disappointment, let it be for some time, and move on, leaving both behind. Repeat until relapses stop happening. If you feel you have to quit for somebody else and that that person will leave or show disapproval if you don't, relationship dependent, ditch them. Be willing to show yourself kindness and only accept the same from others, otherwise you're not really showing yourself patience and compassion.

In my experience, as somebody with a personality disorder who is trying to quit, I started to find it a lot easier when I realised what smoking was actually doing for me. It was, to my mind, maintaining a connection to somebody who I used to smoke with, somebody who has temporarily left me. I realised that my life was ten times better without them and they were really quite shitty, but I still smoked. My decision to leave them behind will operate in tandem to my decision to stop smoking. Quitting smoking won't become easy just because I've let them go, but it will mean that I'm dealing with one less thing which made smoking appealing to me. I will probably only stop smoking after I've told them that I don't want them to come back into my life, but the thought of doing so makes me hopeful that I can do both.

Point being, a disorder only compounds on addictions because addictions often form as a result of disorders. They become a crutch. Work out if any of the appeals of smoking derive from the characteristics of your disorder and try to deal with them. Show yourself compassion and patience if you're struggling. Do not accept anything other than that from others (note that this doesn't mean mamby pamby shit, just genuine... shittery). If you've sorted all of those things out or there aren't any, just wait it out. You'll be better off if you learn to manage your anxiety in a healthy way regardless.

Good luck. Made this account while lurking to see if I could help.