I quit, although some say I didn't because I still have the occasional smoke while I'm drinking. I'm probably also no help on how to quit because I just stopped. For me it was more of a habit than anything else s quitting was as easy as just not doing it anymore. I know it's a lot harder for a lot of people though. Friends have had good luck with quitting cold turkey, but other friends haven't been able to do it without their e-cigs.
My neighbor used Chantrix, but gave it up about a week and a half in because he was having terrible nightmares and homicidal thoughts toward his boyfriend. Oddly, he broke up with the boyfriend a few months later, and has quit smoking