When Gallup first asked about legalizing marijuana, in 1969, 12% of Americans favored it, while 84% were opposed. Support remained in the mid-20s in Gallup measures from the late 1970s to the mid-1990s, but has crept up since, passing 30% in 2000 and 40% in 2009 before reaching the 50% level in this year's Oct. 6-9 annual Crime survey.
According to the National Institute on Drug Abuse, "Marijuana is the most commonly abused illicit drug in the United States." The National Survey on Drug Use and Health in 2009 found that "16.7 million Americans aged 12 or older used marijuana at least once in the month prior to being surveyed, an increase over the rates reported in all years between 2002 and 2008."
The advocacy group National Organization for the Reform of Marijuana Laws claims that marijuana is the third-most-popular recreational drug in America, behind only alcohol and tobacco. Some states have decriminalized marijuana's use, some have made it legal for medicinal use, and some officials, including former U.S. Surgeon General Joycelyn Elders, have called for legalizing its use.
http://www.gallup.com/poll/150149/record-high-americans-favor-legalizing-marijuana.aspx
