Over the last decade the world has experienced a growing interest in problems associated with the nonmedical use of drugs. This interest has corresponded to a real growth in the extent, diversity, and social impact of the use of alcohol and drugs in many societies. As a result, the amount of research and writing on the subject of drug problems has greatly increased, and it has become very difficult for one individual to keep up with all the relevant literature. There is thus an acute need in the field for critical reviews that assess current developments, and the present series is intended to...