Recreational drug policies and regulations are complex issues with many dimensions. This book attempts to answer several questions raised in current drug policy debates. Developing cost-effective drug programs and policies require a sound knowledge of drug users and their characteristics and the relationship across drugs. Who are the drug users? Can demographic factors help towards predicting drug usage? What sub-population groups should be targeted for drug campaigns and educational programs? Can a drug policy aimed at discouraging the use of one drug likely to affect the use of other drugs...