LSD PCP Overview Hallucinogens cause people to experience hallucinations, imagined experiences that seem real.
Some people refer to hallucinating as tripping.
Parts of these trips can feel really good, and other parts can feel really terrible. Hallucinogens powerfully affect the brain, distorting the way our five senses work and changing our impressions of time and space. People who use these drugs a lot may have a hard time concentrating, communicating, or telling the difference between reality and illusion. Chemical messengers transmit information from nerve cell to nerve cell in the body and the brain. Messages are constantly being sent back and forth with amazing speed.