I quit smoking cold turkey when it started to interfere with my weight lifting. I wanted a 3 plate squat more than my post workout smoke. YMMV.

My mother smoked for around 45-50 years herself and quit immediately after her heart attack last year. As a former 17-year smoker myself who started vaping almost 6 years ago when my kid was born, I'd been trying to get her to replace the cigarettes years ago. Didn't work.

Another spot of anecdata, when I was a smoker I couldn't go a few hours without a cigarette. After 6 years of vaping, I can pretty much go 8-10 hours with no real craving.

It's unreal how much less of a hold vaping has on me versus cigarettes when that nicotine isn't coming along with a few thousand other chemical compounds.