"quick note on eating cannabis
If you take it orally, you could be in for quite a ride. The liver metabolises THC into 11-OH-*9-THC, a compound three times more psychoactive. Oral cannabis is a powerful, almost psychedelic experience, very uncomfortable if you're not expecting it. The effects are slower to come on (1 to 2 hours) and last considerably longer (around 4 hours)"