Have you taken your cannabidiol today? It’s increasingly hard to avoid it. CBD is suddenly in everything from beauty and skincare products to chocolate, gin, lattes and pet chews, making coconut milk and dried mushrooms look very last year. The ingredient of marijuana is supposed to have anti-inflammatory, calming qualities and to help prevent headaches and insomnia. In America, it’s everywhere. Kim Kardashian had a CBD-themed baby shower. Gwyneth Paltrow bakes brownies with it and there were CBD-laced products in the party bags at this year’s Oscars.

Would-be Tory and Lib Dem leaders could soon be boasting about taking it on the campaign trail because CBD is legal. It doesn’t give you the high that you can get from another cannabis ingredient, tetrahydrocannabinol (THC). British…