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How long does the THC stay in the system after smoking marijuana ?

I have a friend, who smoked marijuana for the first time and he has never done it before. How long will the THC stay in his system. He s not fat he s an athlete and he is 5 8.
Asked On : Mon, 19 Mar 2012
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Psychiatrist 's  Response
thank you for your query. the half life of THC is highly variable among individuals,depending upon Age, duration of use, quantity, purity of the substance, method of intake, body weight, body fat content, associated medical complications or drug or medication use if any. Also, please note further that the effects/ symptoms of marijuana may wear off relatively early, while it may take much more time for the body to excrete the chemical it completely through urine etc..
Complete elimination of THC may take about 7 to 30 days. however, if your friend has less body fat, you can expect it to be excreted early.
hope i've been able to satisfy your query. please don't hesitate to contact me for any further clarifications.
Answered: Thu, 29 Aug 2013
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