For those of you want to quit smoking or are in the process of quitting, I invite you to take a test at http://www.paniccenter.net/anxietytest/. Try it before your quit and during it if you feel unduly anxious and fearful.
Some people use quitting aids, such as the patch and express real fear of stepping down to a smaller dose. The degree of fear makes them refuse to step down and they feel real panic about it. It might be helpful to you to take the test at such time and to discuss the results with your therapist.
If you've tried doing this, perhaps you'd consider letting us know. People report to me that this is the first time such a reaction happened. How does it affect you?