Exploring the relationship between health policy, public health and the law regarding the controversial use of cannabis, this study assesses the impact of illegality in drug use and compares it with the policies of the U.S., Europe and Australia as well as other developed societies. Current debates about "safe use" and "harm minimization" approaches are evaluated, as well as the experiences of differing prevention, treatment and education policies. Written by two leading drug advisors, the analysis contributes to an important field of research