The central drug policy making body with in the United Nations, for instance, is the Commission on Narcotic Drugs, although the United Nations officially defines a narcotic drug to be "any of the substances, natural or synthetic, in Schedules I and II of the Single Convention on Narcotic Drugs, 1961, and that Convention as amended by the 1972 Protocol Amending the Single Convention on Narcotic Drugs, 1961" Convention against the Illicit Traffic in Narcotic Drugs and Psychotropic Substances, 1988. Article I: Definitions In U.S. legal context, the term "narcotic" specifically refers to opium, opium derivatives, and their semi-synthetic or fully synthetic substitutes as well as cocaine and coca leaves.
Mangione MP, Crowley-Matoka M. "Improving pain management communication: how patients understand the terms 'opioid' and 'narcotic'." Journal of General Internal Medicine . 2008 Sep; 23' (9):1336-8. PMID 18516649 The use of the term "narcotic" in various nonclinical contexts is not of educational or of informative value.
Medical complications common among recreational narcotic users arise primarily from the non-sterile practices of injecting. Skin, lung and brain abscesses, endocarditis, hepatitis and HIV/AIDS are commonly found among persons with narcotic dependencies who share syringes or inhale the drug. There has been much discussion about the dangers related to the adulterants/diluents found in street drugs, such as heroin, where rumours abound about what is used to "cut" street drugs, e.g., ground glass, talcum powder, rat poison, domestic cleaning powders, and other cutting agents. Recent evidence shows that this kind of "dangerous adulteration" is largely mythical and that far less cutting of drugs than is normally assumed actually takes place. However, since there is no simple way to determine the purity of a drug that is sold on the street, the effects of using street narcotics are unpredictable. It remains the case that the greatest risk presented by most illicit drugs relates to the drugs themselves and how they are used, e.g., in conjunction with other drugs (alcohol is a particularly risky drug to use whilst also using other street drugs), in excess (most recreational and non-excessive drug use does not result in harm), and how a drug is administered (such as the sharing of needles).
The intensity and character of the physical symptoms experienced during withdrawal are directly related to the particular drug in use, the total daily dose, the interval between doses, the duration of use and the health and personality of the user. In general, narcotics with shorter durations of action tend to produce shorter, more intense withdrawal symptoms, while drugs that produce longer narcotic effects have prolonged symptoms that tend to be less severe.
Long after the physical need for the drug has passed, the addict may continue to think and talk about the use of drugs. There is a high probability that relapse will occur after narcotic withdrawal when neither the physical environment nor the behavioral motivators that contributed to the abuse have been altered.
The majority of individuals in this category may use narcotics sporadically for months or even years. These occasional users are called "chippers." Although they are neither tolerant of nor dependent on narcotics, the social, medical and legal consequences of their behavior can be very serious. Some experimental users will escalate their narcotic use and will eventually become dependent, both physically and psychologically. The earlier drug use begins, the more likely it is to progress to dependence. Heroin use among males in inner cities is generally initiated in adolescence, and dependence often develops in about 1 or 2 years.
Source: Wikipedia > Narcotic
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