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Marijuana is a cannabis plant that contains over 400 chemicals. Its most active chemical is THC. Marijuana is the most frequently used illegal drug in the United States. Almost sixty nine million people have already smoked marijuana. Marijuana was first used by the Chinese in the early 2700’s BC. The people of India began using marijuana for medicinal purposes. Marijuana was brought to the New World in 1545 by the Spaniards. It arrived in Jamestown in 1611 and became a major cash crop by the 1700’s. Some states began to illegalize marijuana by 1915 and by 1937 marijuana was illegal in every state with the marijuana tax act. Many people believe that marijuana should become legal again but I do not see the good that legalizing marijuana would bring. Marijuana has many harmful effects that most people aren’t aware of or don’t care to be aware of. Someone who smokes five joints in a week is doing as much damage to their body as someone who smoke a full pack of cigarettes everyday. Marijuana also effects the immune system by killing the T-cells which help fight off infection and destroys brain cells. People who smoke marijuana have a greater risk of developing pneumonia