In common usage, drug can be refered to as any substance, natural or synthetic which when introduced into the body will affect the the functioning and behaviour of the individual concerned. Narcotic drugs and psychotropic substances are drugs which when taken affect the central nervous system and alters ones mood, state of mind and/or behaviour. These drugs are otherwise refered to as illicit drugs.
Illicit drugs can be classified into narcotics such as opium, morphine, heroin, stimulants such as coca plants, cocaine, codeine, psychotropic substance such as LSD and barbiturates.
Please note that most of these drugs have their legitimate uses. For example; morphine is a wonder drug in the realm of severe pain relief. In fact, it is the greatest single pain reliever the world has ever known. Cocaine is used in eye surgery and codeine is used in the preparation of cold medicaments .
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