My opinion here may be helpful

I never smoked; but I vape a bit from time to time.
I don't think of myself as a vaper; i'm not addicted, and i find all of this more like a hobby related to electronics and gadgets (which i like a lot).
I started on this world almost a year ago, searching for something to help my girlfriend to quit smoking.
The main reason I vape is for trying what i'm building, or when i try to repair the e-cig. For that, i have 0mg nic liquid vanilla flavour.
I try to not to vape liquids with nic, but sometimes i do for simplicity.
Maybe the proof i have that i'm not addicted is that I still have the first 10ml bottle i bought for me last year. My girlfriend vapes about 10ml per week.
Once, i did vaped a bit hard on a day; and after minutes of intense vaping, i did not like it. It's funny at first (i like to make clouds), but my tongue feels a bit burnt or something.
Also, where one of the main problems of the smokers is the "social cigarette", when one is a non smoker and anyone sees me using an e-cig they become rude, and stupid; some sort of social disapprove. They say again and again that i may get addicted; and yes i know; and yes i heard them the 1st time, and the 2nd... etc.
So basically seems impossible to a non-smoker to get addicted to something even if he/she wanted to: there isn't anyone that approves a vaping non-smoker. (at least, here)
And, even vaping nicotine, seems to be very different to the analog for me. Liquids have PG,VG, nicotine and nothing more. Analogs on the other side have lots of substances to enhance addiction and pleasure. So maybe a non-smoker vaper can be addicted to vaping like anyone can be addicted to coffee, cocoa, alcohol, etc. I read somewhere that nicotine alone it's similar to caffeine in many ways.
PD: My girlfriend hasn't quitted yet. She reduced from 20 analogs to 5 per day.