My first awareness of the possibility was 40-50 years ago when I saw the design for an electronic cigarette in some magazine ... probably Popular Science since I had a subscription back then.
For Christmas 2009, a co-worker was gifted an N'Joy kit and showed it off at work. This prompted me to give it a go. But, in haste not typical of me, I bought a cig-a-like from some company called Knight Stick, which was a total waste of money in all but one aspect. It served to convince me I COULD quit smoking and I immediately started seeking a better alternative. And even though it took a while to find that 'ideal' solution, I dropped the cigarettes immediately.
In 2010 & 2011 I spent an ungodly sum (literally thousands) on various vaping devices, most of which were lacking. And, found ECF and its wealth of information and helpful souls to give me direction. I've gotta tell you though, as with other forums I've been a participant in, this actually increased my spenditures for those several years. Just too many (seemingly) good ideas bantered about, LOL.
For several years now I haven't felt the need to experiment further. Currently using what many of y'all consider old school tech ... ProVari 2.5 with Aspire Nautilus, mix my own eLiquid. It works for me.