Well, if you want to split hairs I will hit the 4 year mark at precisely 5.25pm this afternoon - it was at 5.25pm on Sunday 2 November 2014 when I stubbed out my last ever durrie and shortly after had my first vape. Albeit at the time of that first vape I thought I was going to cough up a lung, I've not had another cigarette since.
So I'm calling it now anyway. (My diary shows I have a very important meeting between 4.30pm & 6pm with someone named 'Jack' so I'll be errr 'busy' when the clock officially ticks over the 4 year mark )
It still amazes me to this day that even having been a heavy 40+ year smoker I was able to relatively easily switch from one to the other and have been able to stay off the smokes ever since.
My utmost thanks to all of you out there who have helped me in so many different ways along the journey.