Ethan Nadelmann, founder and executive director of the Drug Policy Alliance, delivered this TED Talk at TEDGlobal 2014 about the insanity of the drug war.
The reason some drugs are legal and others are not has nothing to do with science or health or the risk of drugs, and everything to do with who uses, and is perceived to use, certain drugs. If the principal smokers of cocaine were affluent older white men and the principal users of Viagra were young black men, using Viagra would land you time behind bars.