The half life (the time it takes for a substance to lose half its pharmacologic activity) of THC is very long (about 3-4 days). So it's totally normal that you still feel a bit cloudy a few days after smoking. read more
However, the vast majority, he said, experience that mild high, which fades after several hours. After days of use, the pot becomes stored in the body's fatty tissue and THC is gradually released into the bloodstream, meaning a person can experience the effect of the drug around the clock. read more