> LSD research of the 1950s was dominated by the idea that the drug could be used to induce and study mental illness ... Presupposing that patients become mentally ill under the effects of LSD, they were creating expectancies ... the subjects who participated in research were hospitalized psychiatric patients who had little choice about partaking in experiments. Preparation for sessions was poor, often consisting of the casual suggestion that the patient will experience a few hours of madness following the ingestion of the drug, not a soothing notion, to say the least.
> And yet, as the 1950s progressed a growing number of publications were describing the LSD experience in radically different terms. ... participants in psychotherapeutically oriented LSD research asked to repeat the experience time and again (Abramson, 1960). The striking differences in the description of the effects of LSD can readily be explained by the striking differences in the set and setting which existed between the two schools of research. ...
> Yet by the 1970s, following the abandonment of psychedelic drug research and the classification of psychedelics as Schedule I drugs, the concept of set and setting would all but disappear from the literature. ...
> Numerous experiments conducted under strictly controlled conditions (double-blind, with placebos) on a wide range of subjects and in different cultures have demonstrated that both mood and actions are affected far more by what people think they have drunk than by what they have actually drunk ... people who expect drinking to result in violence become aggressive; those who expect it to make them feel sexy become amorous; those who view it as disinhibiting are demonstrative. ...
> Over the last decades, principles of set and setting have been employed both as drug policy measures as well as by local and community initiatives in order to reduce the drug harms. Prominent examples include the case of Dutch coffee shops, as well as chill out rooms and free availability of water in clubs where MDMA is commonly used.
[1] https://journals.sagepub.com/doi/10.1177/2050324516683325