Marijuana has been illegal for years because of the thought that it was a drug similar to cocaine, or heroin. Drugs such as cocaine and heroin affect the neurotransmitter dopamine. Dopamine is the neurotransmitter associated with extremely pleasurable sensations. If a drug interferes with its production and causes too much to be produced the result is extremely pleasurable and can lead to severe abuse and addiction. It has recently been proven that marijuana is not a drug that affects the production of dopamine.
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