E-cigarettes (or electronic cigarettes) are battery operated devices that heat a liquid into a vapour for inhaling or also known as “vaping”. The liquid used in e-cigarettes is sometimes called “e-juice” or “e-liquid” and is a mixture of chemicals that include propylene glycol, glycerol (vegetable glycerin) and combined with other ingredients such as flavouring agents. Some mixtures also contain nicotine in varying amounts.