Addiction to alcohol is costly both on a personal level and as a public health issue. But while neither new nor rare, it’s a disease that is misunderstood by many. This week on “Take Care,” Dr. Patrick O'Connor , professor of general medicine at Yale School of Medicine, discusses alcohol abuse and its treatments. O’Connor has written extensively on alcoholism and opioid addiction and is the chief of general internal medicine at the Primary Care Center, Yale-New Haven Hospital.