If you want to find out more about Dianetics and Scientology, the best way to do this is to read an L. Ron Hubbard book on the subject. I personally recommend you read Clear Body, Clear Mind.
This book really helped me with understanding how drugs effect the mind and what the mind is. I learned how drugs make you stupid and, most importantly, how this Purification Program could give me back my mental alertness and my zest for life.