It was a very interesting experience. I weigh about 60 kg and ate 3 of them. About an hour and a half later I started to feel the effects. It felt like I'd suddenly smoked half a cigarette. Looking at the other comments, I'm sure that if I'd eaten 4 or 5 pieces, I would have felt the same effects as if I'd smoked a whole cigarette. It's a lot of fun to be sober and suddenly, out of nowhere, you get high.
I recommend it.