It sure is. I know a guy who was never able to trip for the first time until he took 3 hits of acid, and they were REALLY good hits. He just got your usual euphoric reaction, had a blast. Another friend, who had tripped once before, took 3 of the same hits and went so crazy that his parents thought he had gone insane and took him to the psych ward (poor guy, he was there for three weeks, perfectly sober after the trip ended). 3 hits of that acid put me in a state that was considerably more visual than either of them but with much less mindfuck, it varies wildly from person to person. I also have a friend who got a level 5 trip from 2 grams of shrooms where 5 grams from the same batch got me to level 4. IME, shrooms vary even more than acid, but YMMV. That poor friend of mine who had to take 3 hits of acid to trip for the first time also took 2 grams of those shrooms and got a mild body high, same with 700 mg of mescaline. He's not even overweight or anything, he's tall but skinny.