Eleven key studies that evaluated the effects of smoking bans on heart attack rates informed the committee's conclusions about the positive effects of smoke - free policies. (criticalillnessinsuranceinfo.org)
Confounding factors, such as relative humidity, viral infection, pollution and holidays can also impact heart attack rates, and other studies have controlled for these by varying degrees. (scientificamerican.com)
Multiple U.S. - based studies have documented the impact of smoke - free air laws on decreasing heart attack rates. (sciencedaily.com)