on the smoktechs on a tank what I like to do is fill up the tank (not the carto) and then cover up the bottom hole with my finger tightly. after that i start sucking the juice into the cartomizer use short hard hits to do this. this will fill the cartomizer from the bottom up. after i get a slight gurgly feel i will then put about 5-10 drops into the top and then blow the excess juice out of the bottom. I have given several people this advice and I have been told it has saved them several cartos. It has also saved me several cartos.