Cannabis is a psychoactive drug produced by the Cannabis sativa plant). It contains over 480 constituents, with THC (delta-9-tetrahydrocannabinol) being the main ingredient that produces the psychoactive effect. Cannabis can produce a range of effects that vary from person to person, which makes it difficult to classify it as a single type of drug. However, according to the University of Maryland, it can be classified as a depressant, stimulant, or hallucinogen. Cannabis is almost always smoked, often mixed with tobacco, but it can also be eaten, vaporized, or brewed as a tea. Cannabis products and Δ9-THC are under international control.