Current Marijuana and Other Illegal Substance Use and Trends in the US

"The estimated 27.1 million people aged 12 or older who were current illicit drug users in 2015 (Figure 1) represent 10.1 percent of the population aged 12 or older (Figure 2). Stated another way, 1 in 10 individuals aged 12 or older in the United States used illicit drugs in the past month. Approximately 2.2 million adolescents aged 12 to 17 in 2015 were current users of illicit drugs, which represents 8.8 percent of adolescents. Approximately 1 in 5 young adults aged 18 to 25 (22.3 percent) were current users of illicit drugs in 2015. This percentage corresponds to about 7.8 million young adults in 2015 who were current users of illicit drugs. In 2015, 8.2 percent of adults aged 26 or older were current users of illicit drugs, or about 17.1 million adults in this age group.
"Marijuana Use
"As noted in the illicit drug use section, an estimated 22.2 million Americans aged 12 or older in 2015 were current users of marijuana (Figure 1). This number of past month marijuana users corresponds to 8.3 percent of the population aged 12 or older (Figure 3). The percentage of people aged 12 or older who were current marijuana users in 2015 was similar to the percentage in 2014, but it was higher than the percentages from 2002 to 2013. This increase in marijuana use among people aged 12 or older reflects the increase in marijuana use by adults aged 26 or older and, to a lesser extent, increases in marijuana use among young adults aged 18 to 25."

Source: 

Center for Behavioral Health Statistics and Quality. (2016). Key substance use and mental health indicators in the United States: Results from the 2015 National Survey on Drug Use and Health (HHS Publication No. SMA 16-4984, NSDUH Series H-51). Page 7. Retrieved from
http://www.samhsa.gov/data/
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