Primarily because the euphoria produced by the ingestion of the drug creates a psychological need to repeat the experience.
Narcotic
The Opium poppy plant.
opium
Opium
Morphia
You mean "opium of the people". Opium is a narcotic. It make people less analytical.
Opium is a Scheduled 2 Narcotic according to the Controlled Substance Act.
Opium.
Morphine.
Morphia (morphine) is an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain.
Narcotics are opium derivatives and synthetic compounds that mimic the effects of opium derived drugs, such as Demerol (meperidine) and Methadone (dolphine).
opiates (heroin, opium, codeine, morphine)