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 McKennaWe have wandered into a state of prolonged neurosis because of the absence of a direct pipeline to the unconscious and we have then fallen victim to priestcraft of every conceivable sort.
Terence McKennaThe real truth that dare not speak itself, is that no one is in control, absolutely no one... Nobody is in control. This stuff is ruled by the equations of dynamics and chaos. Now, there may be entities seeking control - the World Bank, the Communist Party, the rich, the somebody-or-others - but to seek control is to take enormous aggravation upon yourself... It's like trying to control a dream.
Terence McKenna