I feel exactly where you're at, I've experienced the same feelings of helplessness plenty of times too. Sometimes I've just hung in there by a thread, not knowing what to do next.
I found a life changing article that showed me how to stop and stay stopped successfully.
If you want to stop the vicious cycle Please read this article - "Smoking Cessation: The Real Psychology Behind It" by Malcolm Baptiste!!! It's On-Line and it helped me a lot.
Now I have discovered a way out!!!!
This forum is a great place to share our successes and failures, encourage each other, and get answers!!!!
Don't give up on yourself. We can do this !!!