"On average, 7% of the ESPAD students stated that they had used marijuana or hashish during the past 30 days. As a proportion of the group reporting lifetime use, this corresponds to roughly four in ten. The highest rates of past-30-days cannabis use are found in the two neighbouring countries of France and Monaco (24% and 21%, respectively), followed by the United States (not an ESPAD country) (18 %) and the Czech Republic and Spain (not an ESPAD country) (15% each).
"In 2016, 28.6 million people aged 12 or older used an illicit drug in the past 30 days, which corresponds to about 1 in 10 Americans overall (10.6 percent) but ranges as high as 1 in 4 for young adults aged 18 to 25. Regardless of age, the illicit drug use estimate for 2016 continues to be driven primarily by marijuana use and the misuse of prescription pain relievers. Among people aged 12 or older, 24.0 million were current marijuana users and 3.3 million were current misusers of prescription pain relievers.
Number of Adults Under Correctional Supervision in the US: "At yearend 2015, an estimated 6,741,400 persons were under the supervision of U.S. adult correctional systems, about 115,600 fewer persons than yearend 2014 (figure 1). This was the first time since 2002 (6,730,900) that the correctional population fell below 6.8 million. The population declined by 1.7% during 2015, which was the largest decline since 2010 (down 2.1%). Additionally, the decrease was a change from a 3-year trend of stable annual rate declines of about 0.6% between 2012 and 2014. About 1 in 37 adults in the United States was under some form of correctional supervision at the end of 2015. This was the lowest rate observed since 1994, when about 1 in 38 adults (1.6 million fewer persons) were under correctional supervision in the nation (not shown)."
Drug Use and Crime Indicators - Comparison Between The US and The Netherlands