Technically, any substance{other than food} {that alters our bodily or mental functioning} is a drug.
Many people mistakenly believe the term drug refers only to some sort of medicine or an illegal chemical {which is taken by drug addicts}.
They don′t realize that familiar substances {such as alcohol and tobacco} are also drugs.
This is why the more neutral term substance is now ud by many physicians and psychologists.
The phra “substance abu” is often ud instead of “drug abu” to make clear that substances such as alcohol and tobacco can be just as harmfully misud as heroin and cocaine.
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We live in a society{in which the medicinal and social u of substances (drugs) is pervasive}: an aspirin to quiet a headache, some wine to be sociable, coffee to get going in the morning, a cigarette for the nerves.
When do the socially acceptable and apparently constructive us of a substance become misus?
First of all, most substances {which are taken in excess} will produce negative effects such as poisoning or inten perceptual distortions.
Repeated u of a substance can also lead to physical addiction or substance dependence.
Dependence is marked first by an incread tolerance, with more and more of the substance required to produce the desired effect, and then by the appearance of unpleasant withdrawal symptoms when the substance is discontinued.
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constitute Drugs (substances) that affect the central nervous system and alter perception, mood, and behavior are known as psychoactive substances.
Psychoactive substances are commonly grouped according to whether they are stimulants, depressants, or hallucinogens.
Stimulants initially speed up or activate the central nervous system, whereas depressants slow it down.
Hallucinogens have their primary effect on perception, distorting and altering it in a variety of ways including producing hallucinations.
The are the substances often called psychedelic (from the Greek word meaning “mind-manifesting”) becau they emed to radically alter one′s state of consciousness.
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