In Never Enough, Grisel reveals the unfortunate bottom line of all regular drug use: there is no such thing as a free lunch. All drugs act on the brain in a way that diminishes their enjoyable effects and creates unpleasant ones with repeated use. Delving into the science of one of the world’s most pressing health problems, she reveals what is different about the brains of addicts even before they first pick up a drink or drug, and highlights the changes that take place in the brain and behaviour as a result of chronic using.