The life of your coils depends mainly on your eJuice. Usually, darker and sweeter liquids, tend to clog up the coils quicker. In addition, doesn't the tank have a RBA coming with it? With it you can build your own coils. I'm sure there are plenty of videos, showing how it's done.and im also sick of wasting coils and money on them, the coils should be lasting alot longer than they have been