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Because marijuana is a fat soluble drug, small amounts will linger in the body for weeks or even months. Generally, one marijuana cigarette will produce a screening level of approximately 200-600 ng/ml of THC metabolite in the urine. Chronic users can have over 1000 ng/ml, and up to 6000 ng/ml. For chronic users, the level of THC declines slower than for occasional users. An abstaining chronic user may require 2 to 3 weeks to get below 100 ng/ml. Therefore, a level of 75 ng/ml in the urine may represent an occasional user who stopped using 2 or 3 days prior to testing; or a chronic user who stopped using 2 or 3 weeks prior to testing.