I quit many years ago now but it was my fourth attempt. (& I had been bad enough to search my garbage for butts when out)
(over 25yrs now) I wrote down all the reasons I wanted to quit (could never remember them when the urge came) and I first stopped smoking on vacation, then at home, when I wanted one, I had to read all the reasons, drive ten miles to the most expensive machine, buy, take two out, throw the rest away, drive another ten miles, go to a gravel pit and 'enjoy'-----didn't do that too many times...
I found changing other things at the same time helped too----boosting up on water soluble vitamins (that tobacco tends to diminish), took up exercising and crafts (just cutting things up and making collages)----after seven years, I noticed that the things that would have triggered me (write down those too, and alternative action) did not
(....I really knew when within two years I lost my marriage, my brother to suicide, my job at the time, my father, and took on the care of my mother, had to buy a house, two teenagers etc------------and afterwards, realized I had not Even Thought about smoking...)
Now, it never even crosses my mind...