<P> Some researchers and anti-tobacco advocates are concerned that irresponsible marketing could make e-cigarettes appeal to young people . There is also a risk that infants or toddlers could ingest the e-liquid from an improperly - stored device . </P> <P> The emergence of e-cigarettes has given cannabis smokers a new method of inhaling cannabinoids . E-cigarettes differ from traditional marijuana cigarettes in several respects . It is assumed that vaporizing cannabinoids at lower temperatures is safer because it produces smaller amounts of toxic substances than the hot combustion of a marijuana cigarette . Recreational cannabis users can discreetly "vape" deodorized cannabis extracts with minimal annoyance to the people around them and less chance of detection, known as "stealth vaping". While cannabis is not readily soluble in the liquid used for e-cigs, recipes containing synthetic cannabinoids which are soluble may be found on the Internet . </P> <P> E-cigarettes may be used with other substances and cartridges can potentially be filled with e-liquid containing substances other than nicotine, thus serving as a new and potentially dangerous way to deliver other psychoactive drugs, for example THC . </P> <P> Cannabinoid - enriched e-liquids require lengthy, complex processing . Some are available on the Internet despite lack of quality control, expiry date, conditions of preservation, or any toxicological and clinical assessment . The health consequences of vaping cannabis preparations are largely unknown . </P>

When were e cigs introduced in the uk