Confussled, I agree that it may be time for you to speak with her doctor about hospice. Don't feel guilty--they can provide care that you are simply unable to. They are also very knowledgeable about the stages of dying. If she IS experiencing pain, they can coordinate her pain medication. If your mom goes into a nursing home or hospice home, perhaps they can provide her with nicotine patches to get through the bad withdrawal stages. The fact that they are probably not good for the liver is a moot point right now. Knowing that I had hep C, but also being aware that I had a 2-pack a day habit for 40 years...when I was hospitalized in a spica (body) cast for weeks following a hip surgery, the medical staff provided me with a daily nicotine patch from Day 1. And that was when I quit smoking for good...over 5 years ago (yay me!)
It's wonderful that you were able to get her outside for a bit today and that she wanted to go. She may still have occasional "good" days like this one.
I do understand how very difficult and stressful the caretaking is. A former b.f. and I had his mother at home with us when she was dying of colon cancer. We both worked full time and had a nurse there when we were at work, but as soon as one of us got home, the nurse left. And there were several times when we got calls saying she had a high fever or some other complication, and an ambulance had been called, so one of us had to leave work and it was usually me, since my b.f. worked in the next state and commuted. The nights were very difficult. We both ended up losing our jobs (this was years ago before new laws), in great part due to the caretaking, and had to end up putting her in a hospice facility anyway prior to her death.
Some of the best advice that has been given to you is to take a little time for yourself each day.
Hugs and God bless,