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How often do you use marijuana? or was this the only time that you have used it?
When did you use the marijuana and when is the hair follicle test?
I am afraid that Marijuana can be tested positive in the blood for about 3 days but in the hair for upto 90 days after a single use. In your case, since you have barely inhaled, it is likely that not much marijuana has gone in. But if the air around you at the time was full of Marijuana (secondary smoke) then it is likely that you have inhaled much more than you are aware of.
In a single use of marijuana, the drug can be detected in the urine for 2-3 days.
I hope this helps.
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