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MARIJUANA Marijuana is the dried buds and leaves of the Cannabis sativa plant. This plant contains more than 400 chemicals, including delta-9-tetrahydrocannabinol (THC), the plant's main psychoactive chemical. THC is known to affect our brain's short-term memory. Additionally, marijuana affects motor coordination, increases your heart rate and raises levels of anxiety. Studies also show that marijuana contains cancer-causing chemicals typically associated with cigarettes. Although banned by the U.S. federal government in 1937, there were 11 million current users of the drug in 1999, according to the Substance Abuse & Mental Health Services Administration, "current" meaning that they had used the drug within 30 days of the survey. In this article you will learn about marijuana, why this drug is so popular and what effects it has on your mind and body. The Plant Cultivation of the Cannabis sativa plant dates back thousands of years. The first written account of cannabis cultivation...

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