Everyone has a different journey - I mixed the two for quite some time, almost 100% vaping during my wifes pregnancy but then ended up back on the smokes, the last year I've been dual using cigarettes and vaping, but in the back of my mind I've been thinking about my upcoming 40th birthday and for me thats just kind of a milestone thing, I felt I wanted to make a real effort to cut out the bad smokes when I hit 40 - I ended up upgrading some of my gear, and trying "short bursts" of no smoking when travelling - I ended up going 2 weeks, then 3 weeks and and I'm now 7 weeks without a smoke and intend to carry on that way. I found it helpful not to make any grand announcements, even to my wife I just said "I think I'll try and smoke less". I now feel comfortable saying "I've quit"
Im that short space of time, I've also got into DIY liquids, building my own RTA coils and own three tanks and one mod more than I did 7 weeks ago
My defining moment was three weeks ago when I was dragging on my Kensei RTA on the terrace blowing massive clouds and thinking to myself.. "man, this **** is better than smoking, I actually enjoy this more than a cigarette".... since then I've really not had any desire to smoke again.