In what decade was the science settled on the health hazard of cigarette smoking?

Debate over the hazards and benefits of smoking has divided physicians, scientists, governments, smokers, and non-smokers since Tobacco nicotiana was first imported to Europe from its native soil in the Americas in the sixteenth century. A dramatic increase in cigarette smoking in the United States in the twentieth century called forth anti-smoking movements. Reformers, hygienists, and public health officials argued that smoking brought about general malaise, physiological malfunction, and a decline in mental and physical efficiency. Evidence of the ill effects of smoking accumulated during the 1930s, 1940s, and 1950s. Epidemiologists used statistics and large-scale, long-term, case-control surveys to link the increase in lung cancer mortality to smoking. Pathologists and laboratory scientists confirmed the statistical relationship of smoking to lung cancer as well as to other serious diseases, such as bronchitis, emphysema, and coronary heart disease. Smoking, these studies suggested, and not air pollution, asbestos contamination, or radioactive materials, was the chief cause of the epidemic rise of lung cancer in the twentieth century. On June 12, 1957, Surgeon General Leroy E. Burney declared it the official position of the U.S. Public Health Service that the evidence pointed to a causal relationship between smoking and lung cancer.

The impulse for an official report on smoking and health, however, came from an alliance of prominent private health organizations. In June 1961, the American Cancer Society, the American Heart Association, the National Tuberculosis Association, and the American Public Health Association addressed a letter to President John F. Kennedy, in which they called for a national commission on smoking, dedicated to "seeking a solution to this health problem that would interfere least with the freedom of industry or the happiness of individuals." The Kennedy administration responded the following year, after prompting from a widely circulated critical study on cigarette smoking by the Royal College of Physicians of London. On June 7, 1962, recently appointed Surgeon General Luther L. Terry announced that he would convene a committee of experts to conduct a comprehensive review of the scientific literature on the smoking question. Terry invited representatives of the four voluntary medical organizations who had first proposed the commission, as well as the Food and Drug Administration, the Federal Trade Commission, the American Medical Association, and the Tobacco Institute (the lobbying arm of the tobacco industry) to nominate commission members. Ten were finally chosen, representing a wide swath of disciplines in medicine, surgery, pharmacology, and statistics, though none in psychology or the social sciences. Candidates qualified only if they had taken no previous stand on tobacco use.

Meeting at the National Library of Medicine on the campus of the National Institutes of Health in Bethesda, Maryland, from November 1962 through January 1964, the committee reviewed more than 7,000 scientific articles with the help of over 150 consultants. Terry issued the commission's report on January 11, 1964, choosing a Saturday to minimize the effect on the stock market and to maximize coverage in the Sunday papers. As Terry remembered the event, two decades later, the report "hit the country like a bombshell. It was front page news and a lead story on every radio and television station in the United States and many abroad."

The report highlighted the deleterious health consequences of tobacco use. Smoking and Health: Report of the Advisory Committee to the Surgeon General held cigarette smoking responsible for a 70 percent increase in the mortality rate of smokers over non-smokers. The report estimated that average smokers had a nine- to ten-fold risk of developing lung cancer compared to non-smokers: heavy smokers had at least a twenty-fold risk. The risk rose with the duration of smoking and diminished with the cessation of smoking. The report also named smoking as the most important cause of chronic bronchitis and pointed to a correlation between smoking and emphysema, and smoking and coronary heart disease. It noted that smoking during pregnancy reduced the average weight of newborns. On one issue the committee hedged: nicotine addiction. It insisted that the "tobacco habit should be characterized as an habituation rather than an addiction," in part because the addictive properties of nicotine were not yet fully understood, in part because of differences over the meaning of addiction

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