Is second-hand smoke a rationale for higher taxes on tobacco or smoking bans? The research used to justify government regulation of second-hand smoke has been powerfully challenged by critics, including Congress’s own research bureau. According to the EPA, the risk ratio for forty years of exposure to a pack-a-day smoker is just 1.19. Epidemiologists as a rule are skeptical of any relative risks lower than 3 and dismiss as random ratios less than 1.3. Science writer Michael Fumento and others have documented how the threat of secondhand smoke has been greatly exaggerated.

The latest word on second-smoke appeared in the May 12, 2003 issue of the British Medical Journal. Two epidemiologists, James Enstrom at UCLA and Geoffrey Kabat at the State University of New York at Stony Brook, analyzed data collected by the American Cancer Society from more than 100,000 Californians from 1959 through 1997.

“The results do not support a causal relation between environmental tobacco smoke and tobacco related mortality,” the researchers wrote, although they do not rule out a small effect. “The association between tobacco smoke and coronary heart disease and lung cancer may be considerably weaker than generally believed.”

“It is generally considered that exposure to environmental tobacco smoke is roughly equivalent to smoking one cigarette per day,” according to Enstrom and Kabat. “If so, a small increase in lung cancer is possible, but the commonly reported 30 percent increase in heart disease risk–the purported cause of almost all the deaths attributed to secondhand smoke–is highly implausible.”

Written By: Maureen Martin and Joseph L. Bast
Published In: Smoker's Lounge Issue Suite