An annual survey by Monitoring the Future has shown us that binge drinking among 12th graders has decreased dramatically over the past 20 years. In 1998, 35 percent of teenagers reported binge drinking; in 2017, it's down to 16.6 percent. Caron: It takes a long time to change social norms and prevention efforts to prevent teen substance use. "We cannot afford to minimize this issue or reduce it," Caron says. "Despite all this success, we can't downplay the fact that…