Some wise words from the Prague Declaration.

A drug-free world – or a drug-free city – is an unrealistic idea and a harmful concept if set as an ultimate goal, just like other utopias that have been set as aims in history. Substances with psychotropic effects are older than mankind and are here to stay, with all their negative as well as positive aspects. However, it is beneficial and realistic to aim to diminish the harms related to drug trafficking and use as much as possible – inter alia by reducing the non-medical consumption of drugs and thus the total volume of related risks by means of prevention, treatment, and regulation.