As President Trump Declares Opioid Emergency, Here’s What to Know About the History of ‘Just Say No’

As he declared the opioid epidemic a national public health emergency, President Trump on Thursday called for “really tough, really big, really great advertising” to "teach young people not to take drugs," and U.S. Attorney General Jeff Sessions echoed that sentiment, stating, “People should say no to drug use."

But it was a different anti-drug slogan that quickly started trending on Twitter: "Just Say No.