I know everyone says, you have to quit for yourself, but in all honestly I haven't.
I didn't even think of quitting, but my children had been learning about the dangers of smoking in school, and come home with horror stories of how I would die early and was destroying my body, there little faces were so upset, so I promised them I would stop, I kept making excuses like oh after Christmas etc, my daughter would get so upset and say but you promised us
So I took her to the Dr with me, so she could see I was trying, and 21 days later I am still quit, and the hugs, kisses and cuddles make it all worth while. I have no intention of ever breaking my promise and that is more than enough to keep me quit forever. That is why my signature says first and last quit, so you see you do not need to quit just for yourself