Filling the gap between reality and government statistics', the Drug Use Surveys use anonymous internet responses to gauge the behaviour and attitudes of club goers and other young people across Europe, North America and countries across the world.
Prevention Update: Search Result
Pew Research found 52% of Americans in favour of marijuana legalisation, although different polls have slightly different angles on this question. (See also Mentor Foundation articles)
Following a Pew poll finding majority support for legalisation of marijuana in the USA this article points to a variety different poll findings. April 2013.