Coloradans woke up to hazy skies Monday morning, as smoke from the Morgan Creek wildfire near Steamboat Springs prompted air quality health advisories from Routt to Summit counties, and smoke from fires in California cast an eerie glow across the Front Range. As recently as 12 years ago, researchers had little understanding of how such smoke impacts human health—if at all, says Colleen Reid, an assistant professor of geography who in 2008 became one of the first U.S. researchers to study the health impacts of wildfire smoke.