When a person is facing addiction, it can be difficult to know what to say. It's important to be supportive, but it's also important to be honest about the challenges that lie ahead. For example, you might say something like, "I'm so sorry that you're going through this. I know it's not easy, but I believe in you and I know you can do it." Addicts often feel like they are powerless and alone, so it's important to let them know that they are not alone in their struggle. You might also say something like, "I'm here for you, no matter what. I love you and I want to help you through this." Whatever you say, be sure to convey your support and your belief in the person's ability to overcome their addiction.