A pod e-cigarette is a small e-cigarette which can be used to vape in a discrete way. These pod systems are being used to vape Mouth-to-Lung. These small e-cigarettes have one container which serves as a mouthpiece, coil and reservoir in one. Once the coil is done, the whole container (or "pod") has to be replaced. Some pod systems can be filled, others can't. Most pod systems are easier to use than any other kind of e-cigarette.