Im not sure where else to put a question seeing how im new. So I hope this gets answered. I am a bit lost on the whole cartridge + eliquid thing. If they all take a cartridge then why is the eliquid even around? I saw the video about topping off so I assume its for that. But how would you take one of the yummy flavors like cheesecake if im just topping off one that tastes like a normal cig? Are there "blank" cartridges or something? Sorry in advance if this is a dumb question.