While his wife and two-year-old daughter watched TV in the living room, David Poses was in the kitchen, measuring the distance from his index finger to his armpit. He needed to be sure he could pull the trigger with a shotgun barrel in his mouth. Twenty-six inches. Thirty-two years old. More than a decade in a double life fueled by depression and heroin.In his groundbreaking memoir, The Weight of Air, David chronicles his struggle to overcome mental illness and addiction. ...