[ARCHIVE ANSWER]
Yes. It hits the blood stream right from the lungs. When you eat marijuana like in a
brownie or a cookie, the THC enters the bloodstream through your stomach. The THC
enters the blood stream faster through the lungs than the stomach.
The amount of THC in your blood depends on the THC in your weed. THC metabolites
will show up in the blood for a maximum of 3 days (72 hrs) from last use. These
metabolites obviously can show up in the urine much longer.