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When one smokes marijuana, its active ingredient THC quickly passes from the lungs into the bloodstream, which then carries the chemical to the organs throughout the body. When THC reaches the brain, it acts on the cannabinoid receptors, resulting in interference with the normal function of these brain areas. Cannabinoid receptors are found in the neurons in many places in the brain, and they influence one's memory, concentration, perception and movement.

Marijuana is a fat based drug; therefore, it is stored in the fatty cells in the body, and may be detected in the fat cells of the body for up to thirty days. The amount of time for the elimination of THC from the body depends on several factors, such as how much and how long a person has used. THC can be detected in urine, blood, and saliva; the amount of time is individual and unpredictable.

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