Smoking ban leads to major drop in heart attacks
The study suggests that secondhand smoke may be a terrible and under-recognized cause of heart attack deaths in this country, said one of its authors, Terry Pechacek of the U.S. Centers for Disease Control and Prevention.
At least eight earlier studies have linked smoking bans to decreased heart attacks, but none ran as long as three years. The new study looked at heart attack hospitalizations for three years following the July 1, 2003 enactment of
"This study is very dramatic," said Dr. Michael Thun, a researcher with the American Cancer Society.
"This is now the ninth study, so it is clear that smoke-free laws are one of the most effective and cost-effective to reduce heart attacks," said Thun, who was not involved in the CDC study released Thursday.
Smoking bans are designed not only to cut smoking rates but also to reduce secondhand tobacco smoke. It is a widely recognized cause of lung cancer, but its effect on heart disease can be more immediate. It not only damages the lining of blood vessels, but also increases the kind of blood clotting that leads to heart attacks. Reducing exposure to smoke can quickly cut the risk of clotting, some experts said.
"You remove the final one or two links in the chain" of events leading to a heart attack, Thun said.
Secondhand smoke causes an estimated 46,000 heart disease deaths and about 3,000 lung cancer deaths among nonsmokers each year, according to statistics cited by the CDC.
In the new study, researchers reviewed hospital admissions for heart attacks in
In
"The need for protection from secondhand smoke in all workplaces and public places has never been clearer," said Matthew Myers of the Campaign for Tobacco-Free Kids, in a prepared statement. He is president of the Washington, D.C.-based advocacy organization.
But the study had limitations: It assumed declines in the amount of secondhand smoke in
One academic argued there's not enough evidence to conclude the smoking ban was the cause of
The decline could have had more to do with a general decline in smoking in
"I don't think it's as clear as they're making it out to be," Siegel said.