Like a cigarette (MTL): (Mouth-To-Lung): The inhale is like a traditional cigarette (first into the mouth and then into the lungs). You vape without filling the room with "clouds," you use much less e-liquid, and your battery lasts much longer.
Like a hookah (DTL): (Direct Lung) The inhale feels like breathing through an open tube (you fill your lungs directly with a lot of vapor). Airy draw with large vapor clouds and maximum flavor delivery from the e-liquid.
Between cigarette & hookah (RDL): (Restricted Direct Lung) The inhale feels like sucking through a narrow straw (directly into the lungs, but with some resistance). Intense flavor delivery of the e-liquid with a satisfying vapor cloud at a pleasant temperature.
Pod Sensation: The resistance size "suggests" the vaping style, but in reality, it is determined by the combination of the resistance size and the aerodynamic design of the atomizer.