Yage is the common name for Ayahuasca, a Peruvian plant associated with Shaman healers.
Ayahuasca reportedly provides spiritual revelations about your purpose on Earth, or the true nature of the universe. Spiritual awakening is often described as becoming aware of higher spiritual dimensions, higher beings, a connection to the earth and in this case (Yage) example earth's higher energies thru plants / herbs.
Yaqui Indians from northwestern Mexico, used peyote to visit Mescalito a nature spirit. Psilocybin mushrooms have a history of use by South American native and Indians in religious, divination, and healing rituals. The key word is ritual. Cannabis is used in rituals or integrated into everyday life similar to don Juan's reference to "the smoke" used frequently - to connect to higher energies. Mediation, sacred rituals, hiking in wilderness, contemplation and so on... create similar connection to higher energies. Ritual implies invitation and invocation along with discipline - other methods are perhaps more natural.
We spend time hiking in the high country wilderness of Colorado. We often find small areas that radiate a wonderful spiritual energy, conducive to mediation. Many spiritual teachers note the high mountains, in general are often a resting place for spiritual energy. The energy of the mountains in California, is to me different than the energy of the high mountains in Colorado.
The late 1960's early 1970's in the USA was a time of spiritual awakening for America's youth. Some became wise and some became foolish, or banal.
My references to spiritual effect, assumes you have experienced spiritual awakening and on occasion wish to revisit spiritual consciousness from the view point of extending spirituality, as much as possible, in your daily life.
If you need to start at square one, then by all means - start at square one......
Ah, I recently read a book about it. I love the Rockies. Actually climbed up to view Surprise Lake and the base of the Grand Teton. Hiking up along a creek, I kept wanting to stop and feel, but my friend lacked the connection, would not not let me