I once went to a barbecue in LA where a group of women in the pool gazebo were swapping recipes – drug recipes. These women were the Nigellas of the prescription drug scene. They knew how to mix their fluoxetine with a nice tasty opioid like hydrocodone. They knew that top-and-tailing their favourite stimulants with a couple of Xanax could produce just the right kind of high. And their recipes had one ingredient in common: Adderall.