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Prevalence of Marijuana in recent years
Marijuana main page Cannabinoids SAMHSA Drug use data.gif and SAMHSA has found a rising percent of American 12th graders have used marijuana in the last 30 days. Worldwide UNODC has also seen an increase of marijuana users, while most other drug uses have seen a decline.
 * Difference between this estimate and the 2010 estimate is statistically significant at the .05 level.]]

Marijuana use in literature
Ronald K. Siegel suggests that inebriation is the "fourth drive", arguing that the human seek mind-altering substances (psychoactive drugs) so much that it rivals with a human's desire to find shelter, or satisfy hunger and thirst.