General orientation. Our mandate -- Our work -- Guiding principles -- A changing context -- Cannabis : effects, types of use, attitudes. Cannabis : from plant to joint -- Users and uses : forms, practice, context -- Cannabis : effects and consequences -- Driving under the influence of Cannabis -- Use of marijuana for therapeutic purposes -- Canadians' opinions and attitudes -- Policies and practices in Canada. A national drug strategy? -- The national legislative context -- Regulating therapeutic use of cannabis -- Police practices -- The criminal justice system -- Prevention -- Treatment practices -- Observations on practices -- Public policy options. The international legal environment -- Public policies in other countries -- Public policy options -- Conclusions and recommendations.