In the absence of good scientific data about the effects of artificial hallucinogens it's good to stick to the natural ones.
Terence McKennaA hallucination is a species of reality, as capable of teaching you as a videotape about Kilimanjaro or anything else that falls through your life.
Terence McKennaThe thing is that it is incredibly frustrating to anyone who would control it, because you can't predict the impact of any technology before you put it in place.
Terence McKennaEarth is a place where language has literally become alive. Language has infested matter; it is replicating and defining and building itself. And it is in us.
Terence McKennaInwardness is the characteristic feature of the vegetable rather than the animal approach to existence. The animals move, migrate and swarm, while plants hold fast. Plants live in a dimension characterised by solid state, the fixed and the enduring. If there is movement in the consciousness of plants then it must be the movement of spirit and attention in the domain of vegetal imagination. (...) This is the truth that the shamans have always known and practiced. Awareness of the green side of mind was called Veriditas by the twelfth century visionary Hildegard Von Bingen.
Terence McKenna