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===Social cues===
[[File:Nationalmuseet - Cophenaghen - brygos vomiting1.jpg|thumb|A drunk man vomiting, while a young slave is holding his forehead. [[Brygos Painter]], 500–470 BC]]
It is quite common that, when one person vomits, others nearby become nauseated, particularly when smelling the vomit of others, and often to the point of vomiting themselves. It is believed that this is an [[evolution|evolved]] trait among [[primate]]s. Many primates in the wild tend to browse for food in small groups. Should one member of the party react adversely to some ingested food, it may be advantageous (in a survival sense) for other members of the party to also vomit. This tendency in human populations has been observed at drinking parties, where excessive consumption of [[alcoholic beverage]]s may cause a number of party members to vomit nearly simultaneously, this being triggered by the initial vomiting of a single member of the party. This phenomenon has been touched on in popular culture: notorious instances appear in the films ''[[Mr Creosote|Monty Python's The Meaning of Life]]'' (1983) and ''[[Stand by Me (film)|Stand By Me]]'' (1986).<ref>
Intense vomiting in [[ayahuasca]] [[ceremony|ceremonies]] is a common phenomenon. However, people who experience "la purga" after drinking ayahuasca, in general, regard the practise as both a physical and spiritual cleanse and often come to welcome it.<ref>Shanon, B. (2002). The antipodes of the mind: Charting the phenomenology of the ayahuasca experience. Oxford: Oxford University Press.</ref> It has been suggested that the consistent emetic effects of ayahuasca—in addition to its many other therapeutic properties—was of medicinal benefit to [[indigenous people]]s of the [[Amazon Basin|Amazon]], in helping to clear [[parasite]]s from the gastrointestinal system.<ref>{{cite journal | last1 = Andritzky | first1 = W. | year = 1989 | title = Sociopsychotherapeutic functions of ayahuasca healing in Amazonia | journal = Journal of Psychoactive Drugs | volume = 21 | issue = 1| pages = 77–89 | pmid = 2656954 | doi=10.1080/02791072.1989.10472145}}</ref>
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