No wonder 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. Some hallucinogens can be found in plants.
Mescaline comes from a cactus called peyote.
And certain mushrooms, also known as magic mushrooms, are hallucinogens. But many hallucinogens are chemicals that don't occur in nature.