I did quit. It took 15 years and at least a dozen serious attempts. I tried just about every available method (gum, patches, cold turkey, nicotine-free cigarettes, vaping, hypnosis...) until landing upon the one that was most successful for me — tracking and slowly weaning my intake. It was a 6-8 week process where I basically locked myself in the house and avoided all triggers as best I could. Alcohol, social interaction, smoking cessation commercials on tv... Inevitably, I would relapse at some point and have to go through the whole process over again.
I haven’t smoked in three years and still this thread has been incredibly triggering for me. I’m having cigarette cravings galore and for the past couple of days I’ve had the same lightheadedness and funny taste in my mouth I used to get when a few hours had elapsed between cigarettes. That’s addiction. One doesn’t “just quit.” It’s a battle, and often a lifelong one at that.