From my experience, I would say it really depends on what kind of smoker you are.

I smoked on and off for over twenty years. I made strong associations with cigarettes in my college years. It was a way to get away, to be different, to meet new people, to relax, etc. Sometimes I smoked two packs a day, but more often a pack a week. I smoked the most while driving or after work or at the bar. My friends at the bar smoked, my girlfriends smoked, my coworkers smoked.

I read long ago that, for some people, nicotine fits like a puzzle piece into a receptor in their bodies. I believe I lack this receptor that causes biological addition and my smoking was due more to Pavlovian conditioning. I never had a morning craving. I never got "the shakes". I quit over a dozen times, sometimes for more than a year.

When I was finally ready, and I have to emphasize that you need to be ready, I actually went out of my way to not have a cigarette while doing the things I strongly associated with smoking. I knew I was ready and it was going to stick because I quit over the course of "Beer Week" (Beer Week is when all the bars in the city have beer specials and events and serve one-off or collaboration beers from around the world). It was the worst time to quit but also the best time to quit. It was a challenge. When my friends at the bar all went out for a smoke, I joined them - without a smoke. When I was done eating dinner, I'd go outside and just sit and think without the cigarette. I even went for a drive with a cigarette in my hand and pretended to smoke it without lighting it up.

Being ready to quit isn't about knowing it's bad for you. To be really honest with you, I quit because I was flirting with a super cute girl who happened to be a doctor (I still remember her name - Rose. Because Rose + Doctor Who). Everything was going great then I interrupted her so I could go outside for a cigarette. The disappointment felt by the both of us when I returned was the gut punch I needed. I still have that pack of cigarettes that I only had three smokes out of.

I've not had a single urge to smoke for nine and a half years now.

Or you could try hypnotherapy. Worked for my mom after smoking for over 45 years.