Banned substances:
They are chemical or natural substances affecting the central nervous system of humans and bringing changes in the functioning of organs of the body, especially the brain. They also affect the individuals’ emotions, feelings and behaviors towards others.

Psychological addiction:
It is the situation resulting from drug abuse and causing a feeling of bliss as well as a psychological motivation and an urgent need for repeated abuse to avoid anxiety and tension and to reach (false) pleasure.

Physical addiction:
It is a situation resulting from a body’s dependence on a drug which leads to the emergence of physical and psychological disorders among the abuser when he/she refrains from consuming the drug abruptly.

Relative immunodeficiency (endurance):
It is the gradual decline to respond to the effect of the drug due to its repeated abuse which requires increasing the dose to obtain the similar effect to that of the previous doses.

Stimulants:
They are substances which increase the usual activity and put the person in an abnormal state (frenzy, violence and aggressive tendency ...) .When the effect of the drug ends, the individual is hit by sleep, disorder, tension and depression, which obliges him/her to consume another dose. The repeated consumption of this drug leads to addiction and a severe physical stress accompanied by severe pain in muscles and tension of nerves.