This document discusses the impact that a person's problematic substance use can have on their family members and friends. It notes that while interventions often focus on supporting the individual with the substance use problem, less attention is paid to the effects on family and friends. These effects can include physical and mental health problems, financial issues, relationship challenges, and domestic violence. The severity of impact depends on factors like whether family members live with the individual, provide their care, experience abuse, or use substances themselves. The document provides an overview of research demonstrating the stress, health problems, and emotional difficulties family members may face when a loved one has problematic substance use.