Disclosed herein are “ketannabis” (or “ketonnabis”) compositions including a combination of: (1) tetrahydrocannabinol (THC); (2) a ketone body component such as beta-hydroxybutyrate (BHB) and/or acetoacetate; and (3) a dietetically or pharmaceutically acceptable carrier. Also disclosed herein are methods of using such ketannabis compositions for producing desired physiological effects. The ketannabis compositions beneficially enhance the euphoric effects of THC without aggravating common side effects or even acting to reduce common side effects such as anxiety, disruption of short-term memory, appetite increases, heart rate increases, and blood pressure changes.