A majority of college administrators in a new survey say that more students believe marijuana to be “safe,” drawing concern that changing national attitudes about marijuana might have downstream effects on college campuses. Administrators say the number of students with marijuana-related problems has either increased (37 percent) or stayed the same (32 percent), while almost none say such problems have lessened. The Mary Christie Foundation and the Hazelden Betty Ford Institute for Recovery Advocacy conducted the survey in conjunction with the National Association of System Heads (NASH).