The International Olympic Committee announced Monday that it will launch a full-scale investigation in the wake of allegations of Olympics-enhancing drug use by viewers. 'We have reason to suspect that as many as 18 million U.S. viewers are artificially increasing their ability to sit through the Sydney Games with illegal substances, particularly marijuana,' IOC president Juan Antonio Samaranch said. 'These drugs enable viewers to watch NBC Olympic coverage beyond the limits of normal human endurance.' Interest-boosting doping, Samaranch said, is particularly rampant among viewers of archery, men's handball, and women's sailing. 