1. Peace, confidence, clarity, self control, control of your emotions how you need it, controlling toughts, creativity, sharp awareness, calmness, happiness, stepping in fourth dimension/slowering of brain waves where time starts to go slower, colours are very vivid and seeing astral realm if one knows how to use their third eye and sixth chakra is open, entering trance states And etc., etc.
2.Usage of substance is “kindergarten” stuff, true adept can manage their states by themselves and their will without substances, and rise even higher than any substance can help, and in turn not ruin one’s soul, chakras and aura, like substances are doing. That’s why you need to be careful and avoid destruction of yourself with drugs.
3. Look at answer 1.
4. It’s not thoughtlessness, but rising above toughts where one is not identified with their thoughts and emotions, and is not affected by it, but learning to control them from above.
In other words, higher frequency and void meditation gives this, where you are higher than toughts and emotions and can see clearly into reality trough them.