I downloaded this app called Vapor Trail. It count how much time and money you save from vaping since quitting the cancer sticks. Yes there are many quite smoking apps that do this but this one has the option to input how much juice you use a day and how much it costs per ml. Awesome feature but I wasn't smoking a lot, only half a pack a day and the cheap local packs. Now I vape premium juice. So the app tells me in the 40 days I haven't smoked I've saved - $53 and change not included vape gear and the fasttech order I plan on placing soon. I really need to get started on diy.