Hallucinogens and related substances are part of a class of drugs called psychoactive drugs. They are so called since they act on your brain of the person using the drug, which may affect in varying degrees the perceptions, emotions, thoughts, as well as the level of consciousness of the person.
These alter the state of mind of the individual for the reason that they perceive something as another object entirely, and may connect other ideas and bizarre and seemingly unconnected ways. Unlike stimulants that increase the capacity of your brain to receive stimuli, this class of drugs instead change the way that a stimulus is translated by the mind.
Using the alterations to how signals being delivered to the mind are received, the drug user's emotions may also be affected accordingly, and will react quite differently while consuming the drug taken. Hallucinogenic drugs are recognized to give individuals a feeling to be detached from reality.
The chemicals within hallucinogens make drug users have a sense of distorted reality. 5meodmt cactus and psilocybin mushrooms produce visions that aren't normally seen by folks who are not users of hallucinogens. The effects of an "LSD" trip may vary according to the amount taken, the surroundings, the individual's tolerance of the drug and the current mood of the drug user.