Asuri,
“You know this…how?”
If you do a little bit of research, you can come to know that many traditions in the yogic sciences have used herbs and drugs as a means to enter into altered states, not unlike shamans.
“It sounds like you are saying you have personal experience of traditional yoga practices in which drugs were “prescribed””
During a few months when I was an ascetic, there was a period when I explored into this area after I had come to a certain depth of meditation.
“Would you please tell us what are some of the siddhis you’re referring to that are aspects of the unconscious?”
Reading other peoples mind or being able to see or hear things from afar, are things which are largely of the intuition. Much of intuition is just certain information in the unconscious which becomes accessible to the conscious. That is why, for example, in dreams it is possible to have certain insight or foresight into things - it is just the unconscious communicating certain information to the conscious mind. And because the language of the unconscious is all of symbolism, it communicates through means of symbols.
Or for example, psychologists are familiar with it, that in certain states of hypnosis, people may possess physical strengthen which is otherwise absolutely outside of their abilities in their normal waking state. Or, just like in yoga, they have been able to hypnotize the mind into recalling “past lives” from the depths of the unconscious. To be able to remember so called past lives is one of the siddhis. Or, similarly, you can hypnotize a person to a point where his whole mind and body can become anesthesized, he becomes immune to pain. This is not different than the process which many yogis do in the East, where they can walk on burning hot coals for hours without feeling any pain. There is nothing magical about it, pain is controlled in certain areas of the brain - and if you can consciously control those areas, you can control pain. But the method for walking on burning hot coals is a certain technique involving awakening of the manipura chakra which awakens certain energies in the subtle body.