I once smoked a shitload of pot and heard voices of demons from hell

I was 16 at the time and what a scary, yet interesting, experience it was. It's hard to explain, but it felt like a portal to hell had been activated in my brain and I could hear them. They sounded like tortured souls similar to the moaning and groaning noises made by the possessed girl in the Exorcist and the demons from the Doom video game (I hadn't seen nor played either at the time).

I also heard them call me 'Fawn' and I began having mental visions of some horrible place. It seemed to be some stone prison complex - like underground tunnels and I saw all kinds of monsters -- some half goat / human. Years later I find out, that Fawn is a creature described as a half goat / human.

I have an American friend who is a major pothead and he has told me many times about similar encounters with monsters from hell. I haven't smoked pot since, but would like to know if you have experienced something similar.