The vapour from this device is produced when the atomiser, a heating element, turns the liquid inside the cartridge into vapour. This liquid, called the e-liquid, cools into an aerosol of tiny droplets, vapour and air.
The e-liquid is also referred to as vape juice or vape oil, e-juice, juice, vapour juice, smoke juice, vaping fluid, vaping juice or e-fluid. It often contains all manner of formulations...