Shisha pens work through vaporisation, where the liquid is being heated up to the point where begins to evaporate. This creates a safe vapour that does not contain any toxins. Conversely, hookahs and tobacco cigarettes work by burning material. During burning many toxic substances are created.
E-hookahs have three main components. These are the battery, the liquid filling and the heating element that is evaporating the liquid. When a puff is taken, the suction causes the battery to activate, which in turn powers up the heating element and lights up the LED at the end of the pen. As the element heats up, it evaporates the liquid into a vapour, which is then inhaled. It is possible to get around 600 puffs from an e-shisha before it runs out.