This question might sound silly, but I need to clarify the terminology of a 4081 cartomizer. Are blank cartomizers the same as empty cartomizers? I want to order a supply however, I keep seeing "blank" or "empty" and I want to make sure I am getting the right thing. When I get them, I just want to add e-liquid and vape away. Not sure if they are the same or if one or the other involves doing something extra. Also does anyone have any suggestions as to a good 4081 cart supplier?