E-cigarettes come in many forms and have multiple parts (see figure below). The devices often look like cigarettes or pens. The vapour mimics the appearance of smoke. The act of using an e-cigarette is often referred to as vaping. Other names for e-cigarettes include vapour pens and electronic nicotine delivery systems (ENDS). These terms are more commonly used in the United States to describe devices that contain nicotine.
There is currently no legislation requiring warning labels, child-proof packaging, or labelling for the amounts of chemicals in the liquid. The sale of e-cigarettes with nicotine is illegal in Canada, yet many are available.