What do the terms “set and setting” mean in relation to psychedelic experiences?

Set refers to an individual’s mindset, including mood, perceptions, and expectations. Setting refers to the context or physical environment where the psychedelic session takes place. Setting also includes anything that is physically located in the space where the session takes place, like music, an eye mask, pillows, candles, etc. Set and setting are critically important as they can influence the experience of the person undergoing the session.