The vaping trend seemingly knows no bounds as the first “cannabis” e-cigarette goes on sale in the UK. The KanaVape, which contains hemp, has been legalised for use in France by people with cancer, multiple sclerosis (MS) and other conditions requiring pain relief. It will go on sale around the world tomorrow but the Home Office has cast doubt on whether that would be legal, saying the product must be tested for controlled substances. KanaVape cannot be compared to a joint because it does not contain THC, the chemical causing cannabis highs.