Part 4 of a 4 part series. In this article, Joseph Vander Veer examines various drugs of abuse including narcotics, alcohol, sedatives, stimulants, marijuana, psychedelic drugs, volatile substances and cocaine. He provides important information for the pastoral counselor about each class of substances. Part 1 is in JPP 3:2, Part 2 is in JPP 3:3, Part 3 is in JPP 3:4, Part 4 is in JPP 4:1.