carl hart.t columbia, university, an air force veteran, and a recreational heroin user. woe talked about that an his book where he explains what the real problem with drugs is. dr. carl hart, welcome to "the daily social distancing show." >> thank you for having me, trevor. good to see you again. >> trevor: you have a new book out that's got everybody talking, "drug use for grown-ups." just to set the stage, you are a tenured professor at columbia, right. >> yes. >> trevor: you are a established and respected neuroscientist. you are not some dude selling little baggies of weed. we're talking to a doctor here. >> yes. >> trevor: first things first -- what is the biggest misconception around drug use? because when people say, like, drug use for grownups, people would be, like, what are you talking, vicodin? what do you mean by drug use? >> when i'm talking about drug use, i'm talking cocaine, mdma, sill seiben, and the biggest misconception is most people who use these drugs are addicted. the vast