The Columbia professor Carl Hart spent his career studying the effects of drugs, and uses heroin himself. In his book Drug Use for Grown-Ups, he argues that not only can drug use be safer, but that it’s our right.  This week on The Experiment: how villainizing drug use interferes with our right to life, liberty, and the pursuit of happiness. Be part of The Experiment. Use the hashtag #TheExperimentPodcast, or write to us at [email protected]. This episode was produced by Alvin Melathe and Katherine Wells, with help from Gabrielle Berbey. Special thanks to Michelle Ciarrocca. Fact-check by William Brennan. Sound design by David Herman. Engineering by Alexander Overington.