I stopped quite a few times with a vape and failed, mainly because I think for me, it was keeping me in the habit of smoking. So, if I ever forgot my vape when out, I'd end up buying fags, then when I'd had one of them I'd think well I may as well carry on smoking now, and ended up stuck in that loop many times.
Cold turkey worked for me. Torturous as times, but worth it because it felt like more of an achievement to me every day that passed without inhaling anything, whereas with the vaping I still kind of felt like a smoker, if that makes sense, so didn't feel too guilty about sneaking a fag here and there.
When I quit, I coughed up a load of gunk that made me panic, but apparently it's your lungs kicking back into action again. Insomnia. A weird one was I had to poo a lot it a day
don't know what that was about. And I broke out in the most horrific acne I'd ever seen in my life. I was literally smothered in red, painful spots. They're called Quitzits, so I'm told 
It's been completely worth it though. I wake up feeling like I've actually slept and not groggy, don't get migraines as regularly any more, don't have yellow fingers ruining the beautiful effort I make with my nails
Oh, and my nails don't flake and peel any more.
You might hate it in the process, but you'll be so glad you did it when you're through the worst of it OP. Good Luck :)