Тема: prostitution research paper?
Drugs most often associated with this term include: alcohol , cannabis , barbiturates , benzodiazepines , cocaine , methaqualone , opioids and some substituted amphetamines. The exact cause of substance abuse is not clear, with theories including one of two: either a genetic disposition which is learned from others, or a habit which if addiction develops, it manifests itself as a chronic debilitating disease. 
In 2010 about 5% of people (230 million) used an illicit substance.  Of these 27 million have high-risk drug use otherwise known as recurrent drug use causing harm to their health, psychological problems, or social problems or puts them at risk of those dangers.   In 2015 substance use disorders resulted in 307,400 deaths, up from 165,000 deaths in 1990.   Of these, the highest numbers are from alcohol use disorders at 137,500, opioid use disorders at 122,100 deaths, amphetamine use disorders at 12,200 deaths, and cocaine use disorders at 11,100.