As an ER doctor, I have treated hundreds of patients who were dying of heroin overdose, and I know that it is a disease that claims lives. As a family member of loved ones who struggled with addiction, I have seen that heroin isn't just an individual disease; it's a family disease. As a public health official in Baltimore, where an estimated 19,000 of our residents use heroin, I have witnessed how heroin ties into the very fabric of our city; it's a community disease. Read more of Dr. Leana Wen's Baltimore Sun Op-Ed here.