Human drug use predates written history, and this film traces that record from the accidental discovery of psychedelic mushrooms by early cave dwellers to opium cultivation in the East, a practice already more than 6,000 years old by some estimates. The story moves forward through centuries of trial, ritual, and trade, showing how substances once gathered from plants and fungi became embedded in medicine, religion, and daily survival long before anyone understood their chemistry. It closes in the present, with a pharmaceutical industry that now manufactures more than 24,000 different drugs, a scale that makes the cave-dwelling mushroom eater and the modern pill bottle part of the same continuous thread rather than separate stories. The film's throughline is that altering consciousness or treating pain with outside substances is not a modern habit but one of the oldest and most consistent behaviors in the human record, running from prehistoric caves to pharmacy shelves without much of a break.