A six-month ban on smoking in all public places slashed the number of heart attacks in a US town by almost a half, a new study has revealed.</cough>
The researchers attribute the dramatic drop to the "near elimination" of harmful effects of "second-hand" smoke - passive smoking. A smoke-free environment also encourages smokers to reduce smoking or quit altogether, the team adds.
"This striking finding suggests that protecting people from toxins in second-hand smoke not only makes life more pleasant, it immediately starts saving lives,"
Glantz says. The researchers claim the study is the first to show that smoke-free policies rapidly reduce heart attacks, as well as having long-term benefits.
"This clearly shows the great need for controls on smoking in public places," says Amanda Sandford of UK pressure group Action on Smoking and Health. "Passive smoking is a killer. The public certainly underestimates the impact of passive smoking on the heart."
The study suggests that although second-hand smoke delivers only a small dose of harmful chemicals, it appears to have a very heavy impact on health. This paradox has puzzled scientists before, says Robert West, an expert on smoking cessation at St George's Medical School, London, "but there are now plausible mechanisms for this".
The risk of lung cancer rises steadily with the amount of tobacco a person smokes, he notes, but the risk of heart attack shows a non-linear relationship. Recent studies have shown "there is an immediate and acute effect of passive smoke exposure as a particulate pollutant," West told New Scientist.
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posted by magullo at 6:47 AM on April 11, 2003