A collection of articles about the controversial use of paraquat (a toxic herbicide) in marijuana eradication programs is presented. Using a question-and-answer format, article 1 presents interviews with experts on all sides of the controversy, focusing on the legal, social, physiological, and ecological implications of the paraquat debate. Article 2 reports on intentions by the United States Drug Enforcement Administration to use the toxic herbicide against marijuana crops in the U.S. The third article discusses the possibility of using niacin to reduce the toxic effects of paraquat. Article 4 presents a final report by the National Institute on Drug Abuse concerning paraquat hazards. The report gives background information, a comparison of marijuana and tobacco, and the results of their study on the contamination of marijuana with paraquat. The final article discusses potential lung damage associated with the use of paraquat-contaminated marijuana. (LH)