Where I am, it doesn't happen that often. It has never happened to me, though I've only been smoking two years.

The only thing I've heard concerning laced weed was that a friend of mine who has been smoking since he was about 12 smoked a joint of some weed with some dealer that was a friend of a friend. He said he was hallucinating and that the joint had to be laced. He was freaking out, majorly. I really do think he was tripping, and that the joint was laced with SOMETHING. He said it smelled like formeldahyde so I have to question why the hell he smoked it in the first place.