How I quit smoking:
1) Moved in with a boyfriend, was forbidden to smoke in the apartment.
2) Winter came, and it was too cold to go outside.
3) I then hand-washed my sweaters from the year before and watched as all the toxic crap I'd been putting in my body went down the drain. One of the sweaters I wore most every day for my smoke break at work had to be washed 5 or 6 times. Grossed me out.
I did slip a time or two at parties, but it wasn't a problem for the most part. I was working as a flight attendant at the time, so there were literally 10 hour stretches where I could not smoke. That gets the poison out of your system, plus you're too preoccupied to worry about smoking. I really feel for people who are so addicted by habit that they can't quit. Once you're past the physical addiction, that's the hard part.
Motherhood: When changing from pj pants to yoga pants qualifies as 'getting dressed'.