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Some THC metabolites have an elimination half-life of 20 hours. However, some are stored in body fat and have an elimination half-life of 10 to 13 days. Most researchers agree that urine tests for marijuana can detect the drug in the body for up to 13 days. However, there is anecdotal evidence that the length of time that marijuana remains in the body is affected by how often the person smokes, how much he smokes and how long he has been smoking.
How long does weed stay in your system? The total amount of time that weed stays in your system depends on the conditions of the user and how frequently they smoke marijuana. As you continue to consume cannabis, the THC accumulates in the body. The more cannabis you consume, the longer it will take for the THC to clear out of your system.