These proceedings of a hearing before the Alcohol and Drug Abuse Subcommittee include testimony about the health and educational effects of marijuana on young people. The materials describe recent findings on the extent of drug use among youth, recent changes in drug use trends, and the consequences of marijuana use on health and intellectual functioning. The report also outlines policies and programs of the National Institute of Drug Abuse. The effects of drug use on driving, reproduction, motivation, moods and behavior are discussed. The testimonies include suggestions on how the government can assist parent groups, and what kinds of behaviors and attitudes parents and teachers should watch for when drug abuse is suspected. The statements of witnesses such as psychiatrists, U.S. senators, pediatricians, substance abuse prevention program coordinators, and a pharmacologist are also included. (JAC)