You will have vivid visual hallucinations and drastic altered states of consciousness, can be pleasurable and illuminating but also can give you feelings of anxiety, revulsion, and paranoia.
You experience a deeply emotional and psychological self- exploration
Side effects of mescaline use includes: anxiety, racing heart, dizziness, diarrhea, and headache. Mescaline containing cacti can induce severe vomiting and nausea, which adds an important part to traditional Native-American ceremonies as it is considered cleansing.
In the United States, mescaline was made illegal in 1970 by the Comprehensive Drug Abuse Prevention and Control Act. It was prohibited internationally by the 1971 Convention on Psychotropic Substances.