Darryl Weaver (played by Tobin Bell) was a paid test subject for the Morley tobacco company. He developed a remarkable reaction to engineered cigarettes that allowed him to survive when all the other subjects died. Even by coming into contact with others while smoking, he could spread a smoke-carried form of tobacco beetle eggs that would hatch inside another person's lungs. In this manner, his inadvertently - but none too regrettably - killed Dr. James Scobie, his landlord, and nearly Fox Mulder. Before he could evade custody, he was shot in the shoulder by Walter Skinner and taken into custody. (TXF: "Brand X")

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