Worldwide, public opinions are changing about the cannabis plant as more and more people come out in support of the end of prohibition.
This excellent American study from the Broookings Governance Study Group has some very recent stats and trends to report. It is bias towards the USA but nevertheless the facts are plain. All walks of life and population groups and trending towards legalisation and the end of criminalisation of cannabis users.
This highly recommended read can be downloaded as a PDF here:  The New Politics of Marijuana Legalisation May13