"I also wrote a one-clause contract with myself, including date and signature and posted on the wall in my office (for only me to see). "I am not going to use Tobacco!" I write and use contracts professionally and have never broken one and don't plan to break this one either. "
That's what daily roll call is: a contract... a contract to yourself, and us, that you will not use nicotine for 24 hours. Your word has to mean everything. Put everything into it.
"I... have never broken one and don't plan to break this one either."
Better is: I have never broken one and will not break this one either. Don't give yourself any room for failure. Failure is not an option when quit.
Welcome!