It seems that a while ago, the World Health Organization performed a study on cocaine use (the source said it was the largest ever indepth study). Then, the results got dimissed and the report was never published, as it didn't conform with the myths propagated by the US anti-drug campaigns and political interests.
The report touched on unjustified stigmatization/vilification of cocaine users, exaggerations of the health damages cocaine produces and the fact that current approaches to stopping the use of cocaine are naive at best (among other things).
The US apparently threatened to withdraw funding from the WHO if the report was published (in the end it seems it was leaked[PDF], not published).
Disclaimer: This post is in no way an endorsement for the use of cocaine (or any other drugs for that matter). I am more interested in writing about the conclusions and the supression of the report, than drugs in general. Besides, IANAD.