how long does weed stay in your system after smoking it
How long does weed stay in your system (blood)? In the blood weed can be present for up to 2-3 days after use, however in cases of heavy and frequent use it can be detected after up to 2-3 weeks.n the tests THC is immediately detectable as soon as the first inhale of weed, and reaches its peak concentration at around 9 min into smoking. It takes between 3-12 hours for THC to decrease at an undetectable level after the last inhale.