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QUICK ANSWER: 2-3 days (without smoking)

the CHEEK SWAB DRUG TEST monitors RECENT use, NOT HISTORICAL. the mouth replaces cheek cells every 48-72 hours. as long as you have not smoked within the 2-3 days before a test, you should be alright (with regular brushing, flossing and rinsing).

there has been a lot of controversy over how effective these tests are. they are VERY effective-... at catching people who smoke the day of the test. seems a little ridiculous that everyone is saying it takes a full month (or sometimes year) to get out of your CHEEK CELLS.

yes, THC remains in URINE for a month or so, but the cheek cells are replaced fast enough that 12+ hours for the infrequent smoker may even be enough (though why cut it that close).

there are also quicker (see: EXPENSIVE) alternatives, though they can get up into the $5

I have a friend that took a swab test for THC .And it tested positive 5 weeks after they stopped smoking...I was told by a counselor that it depends on how often you smoke as to how long it will take to be undetected..usually 4 to 6 weeks

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