Codeine is an opiate used in the treatment of pain and to reduce coughing. It occurs naturally in the opium poppy and as such has a long history of human use. 1987 A categorized index of first-person experiences with Codeine. 1 cig. smoked, Tobacco – Cigarettes. T+ 0:10, 4 Tbsp, oral, Codeine, (liquid). BODY WEIGHT: 200 lb. 2:00 AM I was bored … A list of experiences with Codeine in category Preparation / Recipes. In summary, the codeine high is not extreme, but is very very pleasant. I would recommend taking a strong dose of anthistamines before hand, as … Introduction. This text deals with four known methods of converting codeine to morphine by demethylation (codeine is morphine 3-methyl ether). [Erowid Note: Lean traditionally refers to a mixture of sprite with a prescription cough syrup containing both codeine and promethazine.