When a person has a substance use problem and a mental health problem thats called a dual diagnosis. And it is far more common than you might think. As each problem magnifies the other it can be tough to figure out which to address first. This book explores the ways in which drug use and mental health interact and introduces readers to the techniques used to try and make both situations better. From caffeine and aspirin to heroin and meth drugs are an inescapable part of life in the 21st century.