"I had the flu really bad and was just too sick to smoke. The third day I thought that might be a good time to just quit. I did."
That's exactly what happened to my husband. During my first pregnancy he always smoke outside, and he did so when we brought our son home.
But when our son was about 2 months old, my husband got very sick with the flu, he couldn't smoke, and he just stopped.
"...with the flu, he couldn't smoke..."
I think if one can go a couple days without smoking and then realize that the physical part is over, then it becomes easier to just tell oneself that its all just a matter of not picking up the first one.