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MODEL RELEASED. Cannabis smoking. View of a man smoking a cannabis (marijuana) joint. He is holding the joint over an ashtray. Marijuana consists of the leaves and flowering tops of the hemp plant (Cannabis sativa). The effects of smoking cannabis include mental relaxation, accelerated heart rate, perceived slowing of time and heightened senses. Large doses may result in panicky states, fear of death and illusions. Prolonged use may lead to psychological problems and lung damage. (KEYSTONE/SCIENCE PHOTO LIBRARY/CORDELIA MOLLOY)