Awesome app but one question – 12 Steps Speakers Review

I love this app. The speakers are awesome and I can listen in the car. However I noticed that since using it my data usage is skyrocketing. Is it because I'm now addicted to constantly listening to the speakers when I can't be "in action"? Or would downloading the file allow me to listen without sucking up a lot of data? Anybody knowing? I'd greatly appreciate it.
Review by Nathaniel Bumpo on 12 Steps Speakers.