or chicago, a city that visits the e.r. from heroin overdose. >> taking out the young people, left and right. >> maryland where a toxic blend left 37 people dead since september. the same recipe killed 22 in the last week of january in pennsylvania. a 19-year-old user overdosed on that batch more than once but told cnn he and other junkies knew it was deadly and were seeking it out. >> somebody knows there's heroin bags out there killing people or making them overdose, we know they are the good bags. it's what everybody wants to do. >> good evening, i'm don lemon. thank you for joining us. this is a special edition of "heroin: a century of seduction." celebs like philip seymour