Lung cancer, often called a silent killer, haunts millions of people worldwide. Year after year, it takes more than a million lives — most of them victims of a singular and preventable habit: smoking. Now, a group of researchers says it may have an answer to stop the carnage — targeting the next generation. A new study suggests that banning tobacco sales to people born between 2006 and 2010 could prevent 1.2 million lung cancer deaths by the end of the century. This simulation conducted by researchers from the University of Santiago de Compostela, the International Agency for Research on Cance…