Wasted money on a Kanger Cupti, about to go back to smoking.

I had a Nebox for about 3 months until it stopped working, and the guy at my local vape store sold me on a Cupti. All it does is spit and gurgle. I've tried every trick I've seen online to fix it and the store won't refund me. It sucks, but I've spent so much money on this junk I'm about to just go back to cigarettes. If you have any ideas about getting the Cupti to work please let me know.