Now, in one volume, the latest research from the areas of molcular biology, neurochemistry and behavior analysis of drug abuse and dependence, with, wherever possible, an integration of the data from these various levels of analysis. The ensuing reports point to the complexity of the phenomenon of abuse and dependence and clearly demonstrate that it is determined by a variety of variables from molecular biology and genetics through behavioral history. This complexity is shown, however, to be responsive to rigorous scientific analysis and our success to date gives rise to hope that this distressing public health problem can ultimately be brought under control. Each of the chapters is written by a leading researcher in the field.