Hemp is a variety of the Cannabis sativa L plant species, but—unlike the plant harvested for its flowers and high levels of tetrahydrocannabinol—it contains only trace levels of THC.
Traditionally used since the Stone Age as a source of food, fiber, medicine and building materials, hemp’s high tensile strength and natural water resistance led to its widespread maritime use in rope and canvas sails during the Age of Exploration.
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J.J. McCoy ~ HighTimes.com ~