Hey i just got the sigelei 870 vape pen. it's a dripper and i was wondering ( since i am a little new to it.. quitting smoking and all. ) does the damn cotton need to be exposed and open or does the metal need to be covering it. the dripper tank is clear and on the inside you can see that there is 4 different holes that can be moved by turning to glass. if you turn it a little bit you can see the holes line up with the cotton on the inside of the dripper tank if you turn it more you can close off the holes of the cotton. i don't know if i am supposed to keep the holes closed. open. or if it even matters.