Just wanted to pass on a few things that got me through.....
An urge only lasts for a moment, so just let the time pass.
Mind can't think of two things at the same time, so get distracted.

Sometimes we think we are craving a cig when what we are craving is really the deep breathing that used to go with it. I cut thick straws, like the size from McDonalds, cut them the length of a cig. When I wanted to just relax like I used to with a cig, I'd sit down with my straw and just inhale through the straw. Amazing how satisfying it was and during stressful times it still is for me.
My worst time was after dinner, but the straw became my replacement when ending my meal.

Don't give up, take it a day at a time. Days turn into weeks, weeks into months, ..................for me it's turned into 5 years.