This report, prepared by the National Clearinghouse for Drug Abuse Information, presents information on the deliberate inhalation of volatile substances--the treatment modalities, the pharmacology and chemistry of this drug abuse, and the opinions and practices of recognized authorities in the field. Substances which are currently being inhaled to alter subjective states are divided into three basic classes: the commercial and related volatile solvents, aerosols and anesthetics. Statistics show that the overwhelming majority of those who inhale solvents and aerosol products are young people between the ages of 10 and 15 years. The report describes treatment processes, and psychological, physiological and subjective effects of inhalation. The legal status of those caught illicitly using inhalants is reviewed along with other important issues and opinions on the topic. (Author/PC)