Here's what I've learned about what I need to do to change behaviors in order to remain quit.

I learned the 4 D's;
Distract yourself, do something different.
Delay,
Drink water, and
Deep breathing.

Then, the three R's;
Remind self of the reason for your quit
Refuse to give into negative thoughts.
Rehearse for difficult situations.

But, there's one more, and it's very powerful. l mention it here, and list my own. And that is this:
Gratitude. Yes, remain grateful; that's right, count our blessings.

And the first thing on my list was being grateful for all the positive things I'm doing for myself with my quit.

Cleaning out my lungs.
Exercising, so, more stamina
whiter teeth
breathing better
Skin looks better
The return of my singing voice
clean smelling clothes, hair, hands, house and car.
more time to do things
more money
Bills paid on time, cuz I'm not burning it away.
Rugs without holes.
Clothing without holes.

Anyway, gratitude works for me. Remembering all that I have as a result of quitting helps me stay the course when I'm struggling.

What do you have to be grateful for?

Keep the quit and post before you puff!

Peace!