BSIP BOUCHARLAT / SCIENCE PHOTO LIBRARY BSIP BOUCHARLAT / SCIENCE PHOTO LIBRARY
Cannabis smoking. Face of a man holding up the cannabis joint he is smoking. Marijuana is made up of the leaves and flowering tops of the hemp plant, Cannabis sativa. The effects of smoking cannabis can include mental relaxation, accelerated heart rate, perceived slowing of time and heightened senses of taste, touch, hearing and smell. 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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