When I get too high a dosage I start to get nausea and visual distortions. Only ever happens when I eat though, cause you have to smoke a lot (large quantity), and i dont smoke a lot. I do remember once when a friend made brownies. He didn't tell us the small pan of brownies had an entire half ounce in it. We bought 3 brownies, big ass brownies, and my friend and I each had one and a half. Didn't feel it till a few hours later but it built up and just wouldn't stop building. Both threw up. He was staring at my lamp and thought it was a sunflower while I was watching the pictures on the wall move around. 15 hours after dosing (the next morning) we were still high. And yes, at one point I was in the bathroom and things started going white. I concentrated and calmed down and it stopped. So I've been to the edge of whiting out I think.