How long does weed stay in your system? There’s one particular time frame that always gets mentioned: 30 days. Unfortunately it’s not that simple. Marijuana can linger in your body for a longer — or shorter — period of time depending on a variety of factors.
This is due to the properties of tetrahydrocannabinol, the primary psychoactive ingredient in cannabis. THC is fat-soluble, not water-soluble, which means it stores longer in the body. If THC were water-soluble, it would dissolve within the body and depart your system within days via urine.
THC’s fat-solubility means that body fat percentage plays a huge role in the amount of time weed remains in your body. The amount and frequency you smoke or eat plays a role as well. Exercise patterns and diet also contribute to its storage.
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