I used to smoke 2 packs a day. I think I was more addicted to the smoking behavior then nicotine itself.
What I did is I stopped smoking at home and only smoke when hang out with friends then leave the cig to friends when I leave or throw it to the bin. Never take home.
Didn't really count how many days without smoking, because I didn’t put focus on quitting, but more in smoke less. Eventually I did stayed away from smoking for a long while, my very last cig made me very dizzy and had to puke in toilet because my body didn’t like it anymore. Then never smoke since.