Edible thc is actually metabolized into a different kind of cannabinoid so instead of regular thc , you end up with 11-delta-9 thc, also called THC-COOH I think this particular form of thc is a stronger activaitor of your CB1 (cannabinoid) and CB2 receptors. This resulted in a more prolonged an intense effect all thanks to your liver. en.wikipedia.org/wiki/11-Hydroxy-THC