Data Limitations Make Estimating Demographics of Heroin Users in the US Difficult: "The prevalence of heroin use is extremely difficult to estimate despite the fact that harm to society associated with heroin marketing and use is substantial. A disproportionate number of heroin users are part of the nonsampled populations in general prevalence surveys (persons with no fixed address, prison inmates, etc.) Also, heroin users are believed to represent less than one half of one percent of our total population, making heroin usage a relatively rare event.
Estimated prevalence and trends in use of various substances by young people and adults in the United States and worldwide.
Prevalence of Marijuana Use in Lifetime, Past Year, and Past Month among Persons in the US Aged 12 or Older, by Demographic Characteristics: Number in Thousands
Global Burden of Disease, Mental Health, and Substance Use Disorders: "In 2010, mental and substance use disorders accounted for 183·9 million DALYs [Disability-Adjusted Life Years] (95% UI 153·5 million–216·7 million), or 7·4% (6·2–8·6) of all DALYs worldwide. Such disorders accounted for 8·6 million YLLs [Years of Life Lost] (6?5 million–12?1 million; 0·5% [0·4–0·7] of all YLLs) and 175?3 million YLDs [Years Lived with Disability] (144?5 million–207?8 million; 22·9% [18·6–27·2] of all YLDs).
Prevalence of New Psychoactive Substances (NPS) Among US Youth: "In the United States, there are indications of an increase in NPS use among certain user groups between 2009 and 2013; the prevalence of lifetime use of a 'novel psychoactive substance' among the population aged 12-34 was 1.2 per cent in 2013.235 There are signs of declining use of synthetic cannabinoids among secondary school students in the United States.
Global Prevalence of Cocaine Use: Despite these regional fluctuations, the annual prevalence of cocaine use remained largely stable at the global level
over the period 1998-2014, fluctuating at between 0.3 and 0.4 per cent of the population aged 15-64. However, as the population has grown, the number of cocaine users has increased, from some 14 million in 1998 to 18.8 million in 2014. Meanwhile, it is likely that there has been a decline in per capita consumption of cocaine,
Illegal Drug Use and Marijuana Use in Lifetime, Past Year, and Past Month among Persons Aged 12 and Older in the US by Age, Gender, and Race/Ethnicity, 2015 and 2016
Drug-Positive Rates In US Military: "While the overall illicit drug use rate is holding constant, the number of MRO reviews is increasing (includes legitimate prescription drug use and positive UAs for other pharmaceutical drugs; see Figure 15, page 54). As previously noted, current policy governing prescription drug use may be masking illicit drug use due to open-ended prescriptions. Overall use of amphetamines (including both legal and illegal) is growing at a rate of 2.8 percent per year for all COMPOS.
Estimated Daily Prevalence of Use of Various Drugs By US Youth In Grades 8, 10, and 12 Combined, According to the Monitoring the Future Survey -- Entries in Percentages
"Marijuana, the most widely used of the illicit drugs, did not show any significant change in annual prevalence this year in any of the three grades, nor in the three grades combined. After rising for several years, the annual prevalence of marijuana has more or less leveled out since about 2010.
" Marijuana is by far the most widely used illicit drug. Nearly half of all 12th graders (45%), nearly one third of 10th graders (31%), and over one in seven 8th graders (14%) reported some marijuana use in their lifetime. Among 12th graders, 37% reported some use in the past year, and 23% reported some use in the past month. Among 10th graders, the corresponding percentages were 26% and 16%, respectively, and among 8th grade students, 10% and 5.5%.