Hi all, I`m new here. I bought the njoy ecig. Not the njoypro but the longer one. I like it a lot but... they are now sending the refill cartridges by UPS so it`s getting more expensive. Is there somewhere on this site that can tell me how to make my own refill liquid? I started with the lights and now I use the no nicotine filters, there has to be a way to make my own liquid.