<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> Psychedelics are a class of hallucinogen, and are substances whose primary action is to alter cognition and perception, typically as serotonin receptor agonists, causing thought and visual / auditory changes, and heightened state of consciousness . Major psychedelic drugs include mescaline, LSD, psilocybin, and DMT . Studies show that psychedelics are physiologically safe and do not lead to addiction . In fact, two studies conducted using psilocybin in a psychotheraputic setting reveal that psychedelic drugs may assist with treating alcohol and nicotine addiction . </P> <P> Differing with other psychoactive drugs, such as stimulants and opioids, psychedelics tend to qualitatively alter ordinary conscious experience . Whereas stimulants cause energized feelings and opioids produce a relaxed euphoric state, the psychedelic experience is often compared to non-ordinary forms of consciousness such as trance, meditation, yoga, religious ecstasy, dreaming and even near - death experiences . Most psychedelic drugs fall into one of the three families of chemical compounds: tryptamines, phenethylamines, or lysergamides . </P>

Which target is common to the mechanism of all psychedelics
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