In early 2014, I got my first weed-oil vape pen. It was elegant and silver, with a rechargeable battery that screwed into a transparent cartridge filled with amber-colored marijuana concentrate. I had never liked the feeling of vaporizing actual pot – it wasn’t strong enough, and usually just left me lightheaded – but an oil cartridge attached to an electronic cigarette was different. Each hit got me just as stoned as a puff off a joint, with none of the smoke. It was like a revelation.
I had tried marijuana concentrates before –