Marijuana (cannabis) wasn't invented it was known of and used by Neolithics in the Middle East some 10,000 years ago. Wikipedia has an article that contains the history of this plant, and a link is provided.
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god looked down on people and saw that they were miserable and unhappy so he took it upon himself to create a plant that could be dried and smoked to make people happy and content.
seriously its like asking how apples were invented....................