ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Cannabis smoking. Teenager smoking a cannabis (marijuana) joint. Marijuana is made up 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.
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