It sounds like a cliche new year resolution but I went cold turkey in 2020. I had been smoking moderately for almost a decade. The first ten days were really hard. 45 days on, I still feel the occasional urge to smoke but it is far better.

My personal experience so far is that it is a mind game. You need to truly tell yourself that there is zero possibility to smoke. Unless your mind accepts that, it is not easy to stop.