I definitely don't think what I felt was oxygen deprivation. Oxygen deprivation doesn't give you cottonmouth and the munchies like that. People keep saying the lungs are extremely efficient at absorbing THC out of all the chemicals in cannabis smoke, but I just don't see any good evidence for that. Does anybody have any proof? I must say I'm rather skeptical that virtually all the THC can be absorbed by the lung tissue that quickly.