I have been vaping 2-3 years now after smoking rollups for 30+ years!!
The way i see it is that like you said, vaping isnt good for you but it must be better than the ■■■■ and because i dont want to quit i use it as an alternative. Many of my friends have used it as a way of quitting tho very successfully 
I have tried various ecigs and have settled with using an I-taste MVP with an evod atomiser and RY4 juice.
I do vape at work and in my cab, I also respect none smokers aswell so i am selective of where i vape etc…this just makes life easier all round.
There is loads of info on the web regarding vaping, this is a good site to get any info you may need…
planetofthevapes.co.uk/