Set and Setting: Where Timothy Leary's Famous Phrase Came From

“Set and setting” is one of the best-known phrases to come out of 1960s psychedelic research. It is usually credited to Timothy Leary, and he did more than anyone to make it famous. The idea behind it is older, though, and the phrase has had a long life since, moving from Harvard seminar rooms into sociology, drug policy and everyday speech. This page traces that history: where the term came from, what its originators meant by it, and how its meaning has shifted.

What the Phrase Means

In its original sense, “set” is a person’s mindset: their expectations, mood, personality and intentions. “Setting” is the surroundings: the physical place, the people present and the wider social and cultural situation (set and setting). The claim at the heart of the phrase was that these outside factors shape how a drug experience unfolds, not just the chemical itself. That was a controversial idea in the 1950s and 1960s, when many researchers treated a substance’s effects as fixed.

Before Leary

People who had watched traditional ceremonies had noticed something like this long before it had a name. The Mazatec veladas led by María Sabina in Oaxaca were carefully structured events, held at night, with chanting and a clear role for the healer. Al Hubbard, a colourful promoter of early LSD research, is reported to have been influenced by mushroom ceremonies in Mexico and began arranging homely treatment rooms instead of clinical ones in the 1950s.

Researchers in Canada, including the psychiatrist Humphry Osmond, who coined the word “psychedelic” in 1956, also paid attention to the surroundings in their studies. Our page on where the word “psychedelic” comes from covers that part of the story. The words “set” and “setting” themselves appear in academic writing at least as early as 1958.

Leary and the Harvard Years

Timothy Leary was a clinical psychologist at Harvard when he began the Harvard Psilocybin Project in 1960 with Richard Alpert, using synthetic psilocybin supplied by Sandoz. Leary argued from early on that the expectations of participants and the atmosphere of the sessions explained much of the variation in what people reported. The paired phrase “set and setting” became his shorthand for that argument, and he repeated it in lectures, papers and interviews. Our page on Timothy Leary covers his life and the controversies that ended his Harvard career in 1963.

The phrase reached a wide audience through The Psychedelic Experience (1964), a manual written by Leary, Ralph Metzner and Alpert and loosely based on the Tibetan Book of the Dead (The Psychedelic Experience). The book presented set and setting as the main factors under a person’s control. It sold widely in the counterculture and was quoted in songs, most famously by the Beatles, whose “Tomorrow Never Knows” borrows lines from it.

From Counterculture Slogan to Social Science

After psychedelic research was shut down in the late 1960s, the idea lived on in an unexpected place. The Harvard psychiatrist Norman Zinberg studied how people used a range of drugs, including alcohol and heroin, and why some used them in controlled ways while others did not. His 1984 book Drug, Set, and Setting argued that social rules and rituals, not only the substance, shape patterns of use. That moved the phrase from psychedelics into the sociology of drug use and into harm-reduction thinking.

The historian Ido Hartogsohn has written the most detailed account of the concept’s history. In a 2017 paper he traces how the idea formed, how it was sidelined for decades, and how it returned, arguing that it was one of the most important insights of the early research period (Hartogsohn, 2017). He also argues that the idea applies to whole societies, not just individuals: the way a culture talks about a substance becomes part of the setting for everyone who meets it.

How the Meaning Has Shifted

Over sixty years, the phrase has been stretched in several directions:

• Everyday speech: people use “set and setting” loosely to mean “the right mood and the right place” for almost anything.
• Research design: modern studies describe the environment and preparation of participants in detail, partly because of this idea, so that results can be compared.
• Cultural history: historians use it to explain why the same substances were described so differently in different decades and countries.

It is worth separating the history from the popular myth. Leary did not invent the insight single-handedly, and the phrase has never been a precise scientific term with an agreed definition. What he did was give it a memorable name at exactly the right moment.

Where to Read More

For the wider timeline, from Mazatec ceremonies to mid-century laboratories, see psilocybin mushrooms in history. Hartogsohn’s paper and Zinberg’s book are the two best starting points for anyone who wants to follow the concept in depth.

Mushroom spores are sold strictly for microscopy and research purposes only. The cultivation of psilocybin mushrooms is illegal in many jurisdictions.