Once you've given yourself permission to smoke once during your quit, you will probably do it again.
This is why we stress understanding what you are up against.
Each failed quit makes it harder to quit the next time.
The following link is the accumulated knowledge of 22,000 hours spent watching people going through the quitting process. Many fail simply because they are unwilling to give quitting the time it takes or because they begrudge quitting rather than embrace it.
I sincerely hope you will read it, understand it and have faith in yourself.
Giving in is giving up. Don't give in. It's gonna take the time it takes.
Give yourself the time