I quit by vaping.
I smoked for 15 or 16 years. I tried vaping one time, around 13 or 14 years in, but it didn't do it for me. After a few more years of smoking, i tried a sub ohm vape, which used a low nic salt content. It made massive clouds which whilst making me feel like a twat, actually helped to fuel the illusion that i was smoking. The feel on my throat was similar to the cigarettes i was used to, and overall, it felt like smoking, so i managed to stick to it and not smoke at the same time.
The kicker was that the low salt meant that initially i was vaping more often, but as time went on i was finding that i was having less time to vape so i was t getting as much nicotine. Eventually, after maybe 6 months to a year, i found that one day, i went all day at work without vaping once. And when i realised i just decided... i dont need it, so i left the vape at home the next day.
Its been over a year and a half now, and i dont think about them anymore.
I am really fucking happy.