"The estimate of current heroin use in 2015 among people aged 12 or older was higher than the estimates in most years between 2002 and 2009, but it was similar to the estimates between 2010 and 2014 (Figure 8). However, even when there was a statistically significant difference between the 2015 estimate and prior years, the percentages were approximately the same, except for the estimate in 2014 (0.2 percent). For example, all of these estimates for current heroin use rounded to 0.1 percent. In 2014, the estimate of current heroin use was higher than in all previous years; however, the 2015 estimate does not provide strong support that the increase in 2014 signaled the start of a change in the trend. Future survey years will be useful for monitoring this trend.
"The estimate of past year heroin use in 2015 (0.3 percent) was also higher than the estimates for most years between 2002 and 2008, but it was similar to the estimates between 2009 and 2014 (Figure 9). This shift in heroin use among people aged 12 or older reflects changes in heroin use by adults aged 26 or older and, to a lesser extent, smaller increases in heroin use among young adults aged 18 to 25."

"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."

"• In 2013, 5.7 million persons aged 12 or older used marijuana on a daily or almost daily basis in the past 12 months (i.e., on 300 or more days in that period), which was an increase from the 3.1 million daily or almost daily users in 2006 (Figure 2.15). The number of daily or almost daily users of marijuana in 2013 represented 17.4 percent of past year users.
"• In 2013, 8.1 million persons aged 12 or older used marijuana on 20 or more days in the past month, which was an increase from the 5.1 million daily or almost daily past month users in 2005 to 2007 (Figure 2.15). The number of daily or almost daily users in 2013 represented 41.1 percent of past month marijuana users."

"In this report, estimates of the use of cocaine include use of crack cocaine. Estimates also are presented separately for crack use. In 2015, the estimate of about 1.9 million people aged 12 or older who were current users of cocaine (Figure 1) included about 394,000 current users of crack. These numbers correspond to about 0.7 percent of the population aged 12 or older who were current users of cocaine (Figure 7) and 0.1 percent who were current users of crack (Table A.1B in Appendix A). The 2015 estimate for current cocaine use was similar to the estimates in most years between 2007 and 2013, but it was higher than the estimate in 2014. The 2015 estimate of crack use was similar to the estimates in most years from 2008 to 2014. The 2015 estimates of both cocaine and crack use were lower than most of the estimates between 2002 and 2006."

"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, prompted by a decline in the amount of cocaine available for consumption over the period 2007-2014, mainly linked to a drop in cocaine production in the Andean region. In parallel, the number of heavy cocaine users in North America has declined. This points to an overall shrinking of the cocaine market, although the number of (recreational rather than regular) cocaine users in several emerging markets continues to rise."

"Of the estimated 14.0 million (range: 11.2 million to 22.0 million) people who inject drugs worldwide, UNODC estimates that 1.6 million (range: 1.2 million to 3.9 million) are living with HIV. That represents a global prevalence of HIV of 11.5 per cent among people who inject drugs.¹⁵
"Along with the estimates of the total number of people who inject drugs, the global total and prevalence rates of people who inject drugs living with HIV for 2011 is also lower than the estimated 3 million (18.9 per cent prevalence among people who inject drugs) previously presented by the Reference Group to the United Nations on HIV and Injecting Drug Use for 2008. These reduced estimates are in large part a result of the availability of more reliable information on HIV prevalence among people who inject drugs."

Amphetamine-Type Stimulants

"In 2014, the estimated 1.6 million people aged 12 or older who were current nonmedical users of stimulants included 569,000 people who were current methamphetamine users (Figure 8). Thus, almost two thirds of current nonmedical users of stimulants in 2014 who were aged 12 or older reported current nonmedical use of prescription stimulants but not methamphetamine.
"These numbers of nonmedical users of stimulants and methamphetamine users represent 0.6 percent of the population aged 12 or older who were current nonmedical users of stimulants (Figure 9) and 0.2 percent who were current users of methamphetamine in 2014 (Figure 10). The percentage of the population aged 12 or older in 2014 who were current nonmedical users of stimulants was higher than the percentages for most years between 2005 and 2012. Meanwhile, the percentage of the population aged 12 or older in 2014 who were current users of methamphetamine was similar to the percentages for most years between 2002 and 2013."

"• The prevalence of past month illicit drug use among adult full-time workers was 8.2 percent (Figure 2.3 and Tables 2.2 and 2.3).
"• Nearly one out of five (19.0 percent) workers aged 18 to 25 used illicit drugs during the past month. This was a higher percentage than among the 26-to-34 (10.3 percent), 35-to-49 (7.0 percent), and 50-to-64 (2.6 percent) age groups (Figure 2.3 and Table 2.2).
"• Males were more likely than females to report past month illicit drug use (9.7 vs. 6.2 percent). Males accounted for about two thirds (6.4 million) of the workers who reported past month illicit drug use (Figure 2.4 and Table 2.2).
"• The prevalence of past month illicit drug use for white adults was 8.8 percent, higher than the prevalence for Asian (2.2 percent) or Hispanic (6.7 percent) adults, and lower than that reported for adults who reported two or more races (13.5 percent). The prevalence of past month illicit drug use by Asians was lower than that reported by all other racial/ethnic groups reported here (Figure 2.5 and Table 2.2)."

"About 1.0 percent of people aged 12 or older (2.7 million) had a prescription drug use disorder in the past year, including 2.0 million people with a pain reliever use disorder, 688,000 with a tranquilizer use disorder, 426,000 with a stimulant use disorder, and 154,000 with a sedative use disorder. In 2015, as part of their most recent substance use treatment, 822,000 people received treatment for the misuse of pain relievers, 293,000 people received treatment for tranquilizer misuse, 139,000 received treatment for stimulant misuse, and 116,000 received treatment for sedative misuse.
"Among people aged 12 or older who misused prescription pain relievers in the past year, the most commonly reported reason for their last misuse was to relieve physical pain (62.6 percent). Among past year misusers of tranquilizers, the most commonly reported reasons were to relax or relieve tension (44.9 percent) or to help with sleep (20.4 percent). Commonly reported reasons for misuse among stimulant misusers were to help be alert or stay awake, help concentrate, or help study (26.8, 26.5, and 22.5 percent, respectively). Among past year sedative misusers, the most common reason was to help with sleep (71.7 percent). Even if people misused prescription drugs for conditions for which these drugs are typically prescribed (e.g., for pain relief or to help with sleep), use without one’s own prescription or use more often or at a higher dosage than prescribed nevertheless constitutes misuse.
"Among people aged 12 or older who misused pain relievers in the past year, the most common source for the last pain reliever that was misused was from a friend or relative (53.7 percent), and about one third misused a prescription from one doctor. About 1 in 20 people who misused pain relievers bought the last pain reliever they misused from a drug dealer or stranger."