Marijuana use among U.S. adults has increased to 9.5 percent, more than double the levels of use in 2001-2002 when the figure stood at 4.1 percent, says a new report from NBC News.
But researchers reported problems for users, especially young adults, have also increased. Addiction is one of those problems, the report says.
A majority of Americans also approve of marijuana use. A new Gallup poll released this week shows that 58 percent of Americans favor legalization of marijuana, the highest percentage ever, according to NBC. The data comes from two face-to-face surveys by the National Institute on Alcohol Abuse and Alcoholism (NIAAA) of almost 80,000 U.S. adults.
To read the full NBC report, click here .
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