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 fill this need. The series is not to be an "annual review" in the usual sense. The aim is not to cover all the work reported during the preceding year in relation to a fixed selection of topics. Rather, it is to present each year evaluative papers on topics in which enough recent progress has been made to alter the general scope in a particular area. Owing to the multidisciplinary nature of problems of drug use and dependence, the papers published in each volume will be drawn from several disciplines. However, some volumes may be devoted to one partic ular problem, with individual reviews and papers examining various aspects of it. The composition of the editorial board and the international advisory board reflects these objectives. The editors are members of the senior scientific staff of the Addiction Research Foundation of Ontario."

This volume is the eighth in the Research Advances Series and the fifth published by Plenum Press. The purpose of the series is to review new work in rapidly changing fields. We do not expect reviews to cover the whole field of work on alcoholism and addiction. Nor do we expect that they will be like annual reviews covering all work in a delimited field. Our reviews are designed to explore only the most exciting parts of the total field and to focus on conclusions that can be made about them. The series publishes one volume each year. Volume 8 is an omnibus rather than a theme volume in that a wide range of topics is covered, including research on alcohol, opiates, and tobacco. As usual, the greater emphasis is on alcohol research, reflecting the importance of the problem and the volume of work to be reviewed. With Volume 8 come some changes in the Editorial Board. It will be the last volume in the series for Robert E. Popham who has resigned from the Board. He has been with the series since its inception and has contributed a great deal to its development. The members of the Board are grateful for his help. We are adding two new members: Dr. Howard Cappell, whose field is experimental psychology, and Dr. Edward M. Sellers, in clinical medicine and pharmacology.