Electronic cigarettes (often referred to as "e-cigs") are battery powered devices that heat liquid containing nicotine to produce a vapour that you inhale. The effect is similar to traditional smoking. But electronic cigarettes don't produce smoke, only vapour.
To use a Liberty Flights Premier e-cigarette, simply press the button on the battery to activate it. This heats the e-liquid on the wick in the atomizer head. When you inhale through the mouthpiece, air mixes with the heated e-liquid to produce a vapour, which you inhale, giving you a hit of nicotine. You exhale mostly water vapour.