It's the same nicotine, and a nearly identical delivery method, and it's just as addictive - if not more so in some cases. The reason I believe it can more addictive is because of the constancy of vaping for some: with cigarettes, you 'have a break' and go out now and again. With vaping it can be 'all the time'. The higher frequency makes for ready addiction.
Using people who are 'trying to quit smoking and using vaping as a mechanism' is a poor measure of determining the addictivity of vaping because people are already trying to quit.
Personally, I quit 'light smoking' with vaping rather easily.
But then I took up vaping for about a year, and quitting was brutally hard. I was not even a heavy vaper. It consumed my entire body.
Quitting smoking I would get 'pangs' or 'acute' points where I wanted to have a cigarette - if I could get past that, it would be fine. With vaping ... it was like a constant pain. I think this was related to the nature of usage.
And I was using a log mg vape, I could have easily moved up.
Vaping is a really, really bad idea. Though the nicotine addiction is not nearly so hazardous alone, it's far worse or addicting than say, a coffee addiction - particularly for young people this is a bad idea.