I'd also suggest making your own juices - it will be much much cheaper than buying them premade. And you can add as much flavoring as you want to make the liquid more intense. You can probably find everything you need in one trip to your local craft store. If not, supplies are widely available on Ebay for a few dollars. As others have mentioned, the Do-It-Yourself Eliquid forum here has all the info you need.
Also, if I could make a suggestion - have you considered sucking on a sugar-free hard candy when you have the urge to snack? Or maybe having a low-calorie beverage? Or chewing sugar-free gum, that's good for the teeth, too...

You'd get the flavor, it would keep your mouth busy for awhile, and very few calories. Without the ongoing expense and *numerous* frustrations of
vaping that others have pointed out, lol. (By the way, vaping causes severe dry mouth for many people, especially in the beginning. So having a bunch of low-calorie beverages on hand might not be a bad idea, either way...)