Narcotics ie natural and synthetic substances from substances that can cause opium that has the effect of lowering or altering consciousness.
Drug abuse is very dangerous:
1.Depresan, which suppresses the central nervous system and reduces the functional activities of the body so that the user feels calm, even can make the user sleep and unconscious.When overdosing can lead to death.
2.Stimulan, stimulate body function and increase excitement and awareness.
3. Hallucinogens, the main effect is to alter perceptual or hallucinatory power.
so for whatever reason you use drugs it is very dangerous, for yourself or for others around you.