Vap. pen.. You buy the juice and add it to the vape reservoir. I use 25Mg/Ml and I have a mix of great flavors, including a Kentucky applewood, peppermint, clove, and menthol. I paid a bit extra for the vap chamber (the boss lady did...) It can be cleaned out. I also got a spare battery. If you're in a trigger situation, you'll be sucking on it like that girl in the video was sucking on... Anyway, yeah, if you have an ecig store around you, they even sell no nicotine juice. Ours will mix nicotine to request (within reason.) And, you can mix flavors, to create other flavors (like applewood+a couple drops of clove, and a couple drops of menthol gives a nice cider/pie flavor.)