No, marijuana does not coat your spinal cord. THC acts on cannabinoid receptors in areas of the brain involved in memory, concentration, perception and movement. According to this article in ScienceDaily, the long-term effects of marijuana usage on the central nervous system are minimal, with only slight disturbances in the areas of learning and forgetting.
Minimal Long-Term Effects of Marijuana Use Found in Central Nervous System by UCSD Researchers
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