Life expectancy in U.S. decreases for second year in a row, largely because of rising drug overdose deaths in younger Americans, CDC says.

Life expectancy in U.S. decreases for second year in a row, largely because of rising drug overdose deaths in younger Americans, CDC says. https://t.co/QK1vfo8xN5 pic.twitter.com/71VBUJ0bOD

— ABC News (@ABC) December 22, 2017