There are different types of grass and different types of Buzz

Your friends comment about - "This is Good shit" could be likened to the wine affectionado who sips a Syrah from Australia, another from California and a third from Brazil. He CAN detect differences. His acclaim is not about how drunk each one makes him but about its tone, pallet feel, aroma and spiceyness. Grass can be skunky, or harsh, or well aged or moldy or green or haven an "expansion" which won't permit it to be held in. In addition to smoke, it can also be eaten or used in an ennema. A friend in a National Guard Band was terrified of flying and carried pot brownies on all of his road trips.