"T" was around when I was a youn guy. It was not syn. THC. It was I believe PCP. Maybe mixed with other items. It did make you trip if you snorted or smoked it. I could be wrong, but all the heads around me tried it for a very short time and turned their back on it. I don't think they believed that it was THC, and after a few "trips" had to admit that it did not act like THC at any dosage.
Not here to argue, gut experiences this stuff in the early 80's and it was not... Well... IT was a strong high, but it was a nightmare waiting to happen. I did many hits of "cid" back in the day, and never felt reality being pulled away from me so hard. I spent most of my time keeping myself in check and not enough time kicking back and enjoying.