Answer: Hallucinogens
Step-by-step explanation:
The drugs used by the human beings that causes hallucinogenic effect on the human nervous system. it can be defined as a substance that can cause perceptual anomalies, emotions, change in thoughts, substantial subjective change.
There are many chemicals available that can cause this effect. Example: LSD (lysergic acid diethylamide), datura, morning glory seeds et cetera.