I smoked for ~8ish years
one day i just decided to cold turkey it
not gonna lie, the first few days were rough but you pretty much have to will yourself to suck it up.
also helped that i stopped hangin out with my buddies who smoked a lot at that time. I think if i still hung out with them a lot, it probably would've been damn near impossible to quit.
iirc, i think i just played fifa against the second lowest setting on the cpu, nothin like burying those bitches in goals while i rage internally and pretty much tried my hardest to ignore the people/things that pissed me off
imo, once you get past that two week mark its smooth sailing in terms of cravings. Social cues and habits take a while but if you keep at it it's easy.

but now i recently started vaping LOL, lowest nic content but i think i might be starting to develop a habit.