STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Cannabis drug resin. Coloured scanning electron micrograph of resin (brown) on the surface of processed marijuana (blue green). The resin contains tetrahydrocannabinol (THC), the main psychoactive substance found in the plant Cannabis sativa, which can be smoked to produce rapid, short-lived effects of relaxation and euphoria. Marijuana is an illegal drug in many countries, although a synthetic form of THC is used to treat various illnesses, such as MS (multiple sclerosis).
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