「Smoke-Free Laws Are Saving Lives」（TIME Oct. 30, 2012）参照
For one of the two new studies, published in Archives of Internal Medicine, scientists at Minnesota’s Mayo Clinic analyzed effects of smoke-free laws that were introduced in Olmstead County, MN, over the past ten years. Most of the county’s more than 144,000 residents receive health care from the Mayo Clinic, allowing the researchers to obtain consent to track heart-related health outcomes. In 2002, Olmstead County required restaurants to be smoke-free, and a few years later passed even stricter anti-smoking laws, mandating that all workplaces, including bars, become smoke-free in 2007. When they compared the 18-month period before the restaurant ban to the 18-month period directly afterward, the researchers found a per-capita drop of 33% in the number of heart attacks in the county, and a 17% drop in the number of sudden cardiac deaths. The decline occured at the same time that rates of hypertension, diabetes and other heart-disease risk factors either remained constant or increased, suggesting that the effect was primarily attributable to the more rigid smoke-free laws. The study’s authors also adjusted for the effect of other community anti-smoking efforts, and the drop in heart attacks remained strongly tied to the new policies.
In the second study, published in the journal Circulation, researchers at the University of California, San Fransisco (UCSF) took a different tack. They analyzed the combined the results of 45 previous studies that focused on 33 different smoke-free laws worldwide and their impact on health.