As everyone knows, drugs cause an effect on the mind (A high). Since that effect is basically generated by the brain, is it possible to convince yourself that you are high without drugs? I've read about monks who can enter deep meditative states and even lower their heat rate through mere thought alone, so it at least seems probable. I know certain chemicals are released by the brain that cause these effects, therefore, it appears one could consciously will that process to occur without harmful drugs.