Popular in Canada, electronic cigarettes are promoted as a less harmful way to smoke, and big tobacco companies are hoping to cash in. The Fifth Estate's Mark Kelley takes a look at the industry and where it may be headed. He speaks to some who sing the praises of non-combustible tobacco use. Public Health England believes that nicotine-containing e-cigarettes will help smokers quit cigarettes, but other voices strongly believe that vaping only serves as a gateway to tobacco smoking, especially for teens. In Canada, regulators have to decide how to regulate the e-cigarette revolution.