Thomas De Quincey's 1821 autobiographical essays recount his early addiction to opium, beginning with its use to treat pain and progressing to dependence that shaped his literary imagination. De Quincey describes the drug's pleasures - the enhanced appreciation of music, the dreamlike states, the sense of expanded time - alongside its terrors: nightmares populated by threatening images, withdrawal symptoms that prevented work, years lost to the struggle against dependency. His prose style, elaborate and digressive, itself reflects opium's influence on his consciousness. This edition includes manuscript material that reveals De Quincey's ongoing relationship with the drug beyond what he published, showing that his claimed recovery was partial at best. De Quincey's influence on subsequent writers - including Baudelaire, Poe, and the Surrealists - made this work foundational for literature of altered consciousness. His willingness to document addiction from the inside, treating it as a subject worthy of serious attention rather than mere vice, was unprecedented. For readers interested in Romantic literature, the history of drugs, or autobiography's possibilities, this work remains essential. De Quincey combined personal testimony with philosophical reflection, creating a genre that subsequent writers from William S. Burroughs to contemporary memoir have extended.