I'm pretty sure it isn't laced. I think I just did too big of a hit. I smoked a little less a few times afterwards and it didn't happen again. It's pretty easy to over do it with my bong - my bowl is a lot bigger than most bowls and can probably hold a couple of grams (finely grinded.) It's hard to gauge how much I'm smoking at one time; sometimes I end up smoking almost all of it in one shot.