Patanjali specifically says that there are three paths to the goal of yoga. And they are, control of the breath, control of posture, and light-filled herbs. It says it right there. Stanza 6 of the Yoga Sutras of Patanjali.
Terence McKennaWhat we really are is a community of mind, knitted together by codes and symbols, intuitions, aspirations, histories, hopes - the invisible world of the human experience is far more real to us than the visible world, which is little more than a kind of stage or screen on which we move.
Terence McKennaPsychedelic experiences and dreams are chemical cousins; they are only different in degree.
Terence McKennaI think the world is growing more psychedelic every day. I'm completely hopeful. . . . This is how it should be. This is what it's like when a species prepares to depart for hyperspace.
Terence McKenna