Charles Schuster, professor of psychiatry and behavioral neuroscience at Wayne State University and a former director of the National Institute on Drug Abuse, called recent research on the illicit hallucinogen drug, psilocybin, a landmark. "I believe this is one of the most rigorously well-controlled studies ever done\'\' to evaluate psilocybin or similar substances for their potential to increase self-awareness and a sense of spirituality, he said. The study is one of the few rigorous looks in the past 40 years at a hallucinogen\'s effects. The researchers suggest the drug someday may help drug addicts kick their habit or aid terminally ill patients struggling with anxiety and depression.