I just went back and read some of your first posts. You used the word committed and commitment a lot.
That's what it takes....commit to the quit! You can do it.
I know going back and reading my own words helped me, try it.
You already said that work is a big trigger, boy I know how true that is.
I'm assuming you can't quit your job, so.....you need a plan to get you through your work day.
Try some different things until something clicks.
Keep in your mind to get through today, just today. One day at a time. Pull up that strength for just today.
You smoked for 42 years. That's a long time, so to rewire your brain will require some work. It's doable.