The percentage of U.S. adults who smoke has fallen dramatically during the past 50 years, from 42 percent in 1965 to just 15 percent in 2015.1 Despite this decline, roughly one in five U.S. deaths is due to tobacco-related disease, making it the nation’s top cause of preventable disease and death.

The persistent separation of racial groups across U.S. neighborhoods has lessened slightly due to mixed-race marriages, according to researchers at Pennylvania State University and the University of Washington. But residential patterns differ depending on the racial makeup of the couple. Residential Segregation Declining Overall, residential segregation—neighborhood separation of whites, blacks, Asians, and Hispanics—has been consistently…