Does it help you quit smoking? Yes, if you want it to and stick with it.
Does it save money? Yes, if you get the hardware you want/need at the beginning and don't spend months buying one thing after another, trying to find something that's going to work for you in all situations. And if you don't give up your addiction to cigs by becoming addicted to buying The Latest Best Ultimate PV that will always be coming out.
Vaping is not smoking, and you'll probably have some withdrawal symptoms, because of all those other things in cigarettes that aren't in juice. You can power your way through it, or you can give in and light up. And you can always chase the latest thing - there's always going to be a latest thing, with new features, more power, longer power, better looks. Start chasing that and you'll easily spend more with vaping than you ever dreamed with smoking.