Prevalence of Illegal Drug Use in Australia: "There was no change in recent use of most illicit drugs in 2013, and use of any illicit drug remained stable between 2010 and 2013. However, there was a significant change for a few specific drugs. The proportion of people who had misused a pharmaceutical rose from 4.2% in 2010 to 4.7% in 2013, whereas there were falls in the use of ecstasy (from 3.0% to 2.5%), heroin (from 0.2% to 0.1%) and gamma hydroxybutyrate (GHB).
"In 2017, an estimated 20.7 million people aged 12 or older needed substance use treatment. This translates to about 1 in 13 people who needed treatment. Among young adults aged 18 to 25, however, about 1 in 7 people needed treatment. For NSDUH, people are defined as needing substance use treatment if they had an SUD in the past year or if they received substance use treatment at a specialty facility in the past year.4
"It is estimated that in 2016 some 275 million people worldwide had used drugs at least once in the previous year (range: 204 million to 346 million). Corresponding to 5.6 per cent of the global population aged 15–64 years (range: 4.2 to 7.1 per cent), or approximately 1 of every 18 people. The actual number of people who use drugs increased by 20 million people from 2015 to 2016.