Caapi has a long history as the master plant teacher. A current new good book is "The Year of Drinking Magic, Twelve Ceremonies with the Vine of Souls" by Guy Crittenden, excellent reading.
I like what he said (several pages in):
Our being cut off from this altered state benefits corporations, which need obedient workers toiling inside what Timothy Leary called air-conditioned ant-hills. They prefer their staff and customers to not access subversive truths.