My worst experience? Oh man. I bought an ounce of some super-dank (Or according to my dealer, "THIS SHIT IS FI-I-I-I-I-RE") Started to smoke it in large quantities, started to get really super stoned, more than what really strong weed would do. I would grind my teeth together and tense every muscle in my body and I just kept telling myself it was just really strong weed. Once the ounce was blown, I was fiending for more, I wound up buying nearly a half a pound of the same stuff from the same dealer over the course of 6 months. When he finally ran out, I started to buy his "normal" weed. It wasn't doing it, kind of the same effect, but it was missing the amped up high I got from his other shit. I also started to lose interest in school, my family, I couldn't sleep, I couldn't eat, I could barely keep myself upright while walking around. Finally after about 3 months of smoking the "normal" weed, I went back to normal, just one day started to get motivated about shit again. I asked him if he ever sold me laced weed just a few weeks ago, his response? "Yeah man, that super-dank you kept buying? Shit had Crystal Meth in it, thought you knew." I never bought from him ever again. Young-Ents out there, MAKE SURE YOU KNOW WHAT YOU'RE BUYING. I always thought laced shit was non-existent, but trust me kids, it's out there, if you feel something different than you're regular high in terms of excess energy, grinding teeth, and craving more at all hours of the day, THROW IT OUT.