Chemdog from GreenHouse Seeds, it made 4 adults puke they got so buzzed sharing a blunt between 4-5 people. It was totally narcotic and huge yielder, I got 13oz of dry bud from one big lady in closet grow.
I have been toking for over 11 years and ive yet to have any experience like this. maybe it was the dirty addons of the blunt wrapper.
I've been smoking for a little more than 40 years, and while I haven't tried the Chemdog from GHS, I did used to have a very special pheno of Killer Queen by Bros. Grimm (G13xC99) that would make people puke if they smoked a hit or two too much. So it can happen.
In my 40+ years of smoking, it was the only cut that ever did that....so it is rare. I was as skeptical as you when people started telling me it made them puke, I thought they were just light weights that didn't know good herb when they smoked it. For most it was for real one or two hit quitter, but if you persisted and wanted to finish a whole bowl, you would get so high that you could be overcome with nausea and puke. Totally stupefying buzz though. You couldn't even carry on a conversation because you would forget what you were talking about mid sentence. Strongest I ever had by a long shot, but not a very enjoyable buzz because you were just incapacitated by it. I had several people accuse me of sprinkling something on it, it was so strong and narcotic they couldn't believe it was just pot. Couldn't drive on it, couldn't socialize on it, couldn't keep up with a movie on it.....you were just retarded. A keeper for the sheer unequaled power, but not fun to smoke. IMHO