"Annual marijuana prevalence peaked among 12th graders in 1979 at 51%, following a rise that began during the 1960s. Then use declined fairly steadily for 13 years, bottoming at 22% in 1992—a decline of more than half. The 1990s, however, saw a resurgence of use. After a considerable increase (one that actually began among 8th graders a year earlier than among 10th and 12th graders), annual prevalence rates peaked in 1996 at 8th grade and in 1997 at 10th and 12th grades. After these peak years, use declined among all three grades through 2007 or 2008.
"In 2018, an estimated 164.8 million people aged 12 or older used a substance (i.e., tobacco, alcohol, or an illicit drug) in the past month (Figure 1). This number of current substance users corresponds to 60.2 percent of the population. About 2 out of 5 people aged 12 or older (108.9 million, or 39.8 percent) did not use substances in the past month.
" The vast majority of 12th graders disapprove of regular use of any of the illicit drugs (see Table 8-6). Among 12th graders in 2017, 65% disapprove (including strongly disapprove) of regular marijuana use and between 92% and 96% disapprove of regular use of each of the other illicit drugs.
"For a number of years, 12th grade African-American students reported lifetime, annual, 30-day, and daily prevalence levels for nearly all drugs that were lower – sometimes dramatically so – than those for White or Hispanic 12th graders. That is less true today, with levels of drug use among African Americans more similar to the other groups. This narrowing of the gap between African Americans and other racial/ethnic groups is also seen in 8th and 10th grade, indicating that this narrowing in 12th grade is almost certainly not due primarily to differential dropout rates.
"Nationwide, 35.6% of students had used marijuana (also called grass, pot, or weed) one or more times during their life (Supplementary Table 106). The prevalence of having ever used marijuana was higher among black (42.8%) and Hispanic (42.4%) than white (32.0%) students, higher among black female (44.9%) and Hispanic female (42.7%) than white female (32.1%) students, and higher among black male (40.5%) and Hispanic male (42.1%) than white male (31.7%) students.
"In 2015, approximately 20.8 million people aged 12 or older had an SUD in the past year, including 15.7 million people who had an alcohol use disorder and 7.7 million people who had an illicit drug use disorder (Figure 27). An estimated 2.7 million people aged 12 or older had both an alcohol use disorder and an illicit drug use disorder in the past year (Figure 28). Thus, among people aged 12 or older in 2015 who had an SUD in the past year, nearly 3 out of 4 had an alcohol use disorder, and about 1 out of 3 had an illicit drug use disorder.
Alcohol Use by 50-Year-Olds in the US: "Alcohol consumption is relatively high among 50-year-olds, with over two thirds (68%) indicating that they consumed at least one alcoholic drink in the prior 30 days, 11% reporting current daily drinking (defined as drinking on 20 or more occasions in the prior 30 days), and 19% indicating recent occasions of heavy drinking (defined as five or more drinks in a row on at least one occasion in the prior two weeks).
Estimated Past Year Prevalence of Cocaine and Crack Use Among Young People in the US: "Past-year cocaine use in 2015 among 12th graders has been essentially the same across regions and varied between 1.8% and 2.3%, with the exception that the West stood out and climbed to 4.4% in 2015 (Figure 5-10b; also Tables 36-38 and Figure 81 in Occasional Paper 86). In past years regional variation in cocaine use was the largest observed for any of the drugs.
"As noted in the illicit drug use section, an estimated 24.0 million Americans aged 12 or older in 2016 were current users of marijuana (Figure 15). This number of past month marijuana users corresponds to 8.9 percent of the population aged 12 or older (Figure 17). The percentage of people aged 12 or older who were current marijuana users in 2016 was higher than the percentages from 2002 to 2015.
"An estimated 16.7 million people aged 12 or older in 2017 who were heavy alcohol users in the past month (Figure 5), which represents 6.1 percent of the population aged 12 or older (Figure 7). In 2017, 174,000 adolescents aged 12 to 17 were current heavy drinkers. Stated another way, about 1 out of 140 adolescents (0.7 percent) engaged in binge drinking on 5 or more days in the past 30 days. About 1 out of every 10 young adults aged 18 to 25 (9.6 percent) were current heavy alcohol drinkers.