(Global Prevalence of Use of Alcohol and Tobacco) "Global estimates suggest that past-month prevalence of tobacco use (25 per cent of the population aged 15 and above) is 10 times higher than past-month prevalence of illicit drug use (2.5 per cent). Annual prevalence of the use of alcohol is 42 per cent (the use of alcohol being legal in most countries), which is eight times higher than annual prevalence of illicit drug use (5.0 per cent). Heavy episodic weekly drinking is eight times more prevalent than problem drug use.
Estimated prevalence and trends in use of various substances by young people and adults in the United States and worldwide.
(Global Estimate of Prevalence of Injection Drug Use) "Updating the previous global estimates, the United Nations Office on Drugs and Crime (UNODC) estimates that in 2011 a total of 14.0 million (range: 11.2 million to 22.0 million) people injected drugs worldwide, which corresponds to 0.31 per cent (range: 0.24-0.48 per cent) of the population aged 15-64.14 The current global estimates are lower than the previous ones of 15.9 million people, and primarily reflect the fact that many countries have revised their earlier estimates downward, based on behavioural surveill
(Initiation of Nonmedical Use of Prescription Psychotherapeutics in the US, 2013)
(Nonmedical Prescription Drug Use by Young Adults Aged 18-25 in the US, 2013)
(Nonmedical Use of Psychotherapeutic Drugs by Type, 2004) "In 2004, 6.0 million persons were current users of psychotherapeutic drugs taken nonmedically (2.5 percent). These include 4.4 million who used pain relievers, 1.6 million who used tranquilizers, 1.2 million who used stimulants, and 0.3 million who used sedatives. These estimates are all similar to the corresponding estimates for 2003.
(Illicit Substance Use by 'Lifetime' Alcohol Users in the US) "Lifetime alcohol users aged 21 or older had a significantly higher rate of past year illicit drug use (13.7 percent) compared with lifetime nondrinkers (2.7 percent). In addition, lifetime alcohol users had significantly higher rates of past year use across all illicit drug categories, with the exception of inhalants (Table 1). Nonmedical use of pain relievers was the illicit drug used most often by lifetime nondrinkers, whereas lifetime alcohol users reported using marijuana most frequently."
('Lifetime' Alcohol Users and Other Drug Use) "In 2002 and 2003, an estimated 88.2 percent of persons aged 21 or older (175.6 million) were lifetime alcohol users, whereas an estimated 11.8 percent (23.5 million) were lifetime nondrinkers. Over half of lifetime alcohol users (52.7 percent) had used one or more illicit drugs at some time in their life, compared to 8.0 percent of lifetime nondrinkers.
(Comparison of Youth Substance Use in the US and EU) "The concept of 'illicit drugs' includes marijuana, hashish, amphetamines, cocaine, crack, ecstasy, GHB, LSD or other hallucinogens, and heroin. GHB has been added to this list since the 2007 ESPAD report. Reported use of any of these illicit drugs varies considerably across the ESPAD countries. In the Czech Republic, 43% of the students report having used any of the drugs in question at least once, which is more than twice the ESPAD average of 18%.