Cannabis and related disorders
Definition
Cannabis, more commonly called marijuana, refers to the several varieties of Cannabis sativa, or Indian hemp plant, that contains the psychoactive drug delta-9-tetrahydrocannabinol (THC). Cannabis-related disorders refer to problems associated with the use of substances derived from this plant.
Description
Cannabis—in the form of marijuana, hashish (a dried resinous material that seeps from cannabis leaves and is more potent than marijuana), or other cannabinoids—is considered the most commonly used illegal substance in the world. Its effects have been known for thousands of years, and were described as early as the fifth century B.C., when the Greek historian Herodotus told of a tribe of nomads who, after inhaling the smoke of roasted hemp seeds, emerged from their...
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