Another study confirms that areas that have a smoking ban experience significant drops in heart attack rates. These findings also teach us a lot about the danger of secondhand smoke.

These latest stats came in today from Colorado.

A smoking ban in one Colorado city led to a dramatic drop in heart attack hospitalizations, according to a new study that is considered the best and longest-term research to show such a link.

The rate of hospitalized cases dropped 41 percent three years after the ban of workplace smoking in Pueblo, Colo., took effect. There was no such drop in two neighboring areas, and researchers believe it’s a clear sign the ban was responsible.

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.

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.

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.

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