What the hell am I doing wrong? I bought a Puff tank filled it up no problems. I bought a replacement cart for it, put it in filled the puff tank, filled the cartomiser, primed it by hitting the button a few times before inhaling, took a drag and burnt out, that horrible burning taste, cart was ruined, so I bought another, did the same thing also burnt out. I give up at the moment, what am I doing wrong?