This secondary school curriculum guide, the subject of a citywide teach-in in the New York City schools, provides facts, lessons, and learning activities designed to provide information about and to prevent the use of crack, a form of cocaine. The guide covers the facts about crack, the reasons given for using crack, strategies for saying no to drugs, and insight into making decisions on drug use. These core materials are supplemented by lessons in the subject areas of social studies, science, mathematics, and communication arts. The subject area lessons provide information of the dangers of crack to the individual, to the community, and to the country. Follow-up activities are also suggested. This material is divided into nine lessons: (1) Crack! A National Epidemic; (2) Crack: It's Your Decision; (3) Pharmacology of Crack; (4) How Medicines or Drugs Can Affect Our Bodies; (5) Drug Use and Body Chemistry; (6) A Tale of Human Bondage: Interview with a Crack Dealer; (7) Effects of Crack on Our Society; (8) The High Cost of Crack; and (9) Who Is Responsible for Halting the Crack Epidemic? A fact sheet for teachers and a poster are included. (KH)