"The preamble of the 1961 United Nations single convention on narcotic drugs states that the “health and welfare of mankind”, and I repeat “health and welfare of mankind”, is the main objective of that convention. Unfortunately, current drug policies in many countries will not lead to the achievement of that objective."

http://www.tdpf.org.uk/blog/kofi-annan-calls-world-health-assembly-legally-regulate-drugs