All of you who have been through high dose psychedelic experiences know that it's very hard to carry stupid baggage through that keyhole. In fact you're lucky if you just get your soul and yourselves through and intact.
Terence McKennaPatanjali 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 McKenna