been reading and learning alot on here, kind of addicted to this site, but anyway, I am only a few weeks into using my 510, now about the parts -the atomizer is the part that screws into the battery and you add the liquid into, right ? Does this part wear out ? Does it need to be replaced ? how do you know when ? The 'mouthpiece' is this the cartomizer Or cartridge? My wife has a flat one, I have a round one, but there is a little piece of fiber in there ,I was told to keep it moist ? The guy at the e-cig store told me this will last a looong time, I read that it doesnt ? How do you know when to replace it ? please clarify, and again THANK YOU