Substance abuse is considered a health issue because it can lead to a range of physical and mental health problems. Long-term substance abuse can damage the liver, heart, brain, and other organs, and increase the risk of chronic diseases such as cancer and heart disease. Substance abuse can also lead to mental health issues such as depression, anxiety, and psychosis. Additionally, substance abuse can have negative impacts on a person’s relationships, work, and overall quality of life. Thus, it is important to view substance abuse as a health issue and to provide effective treatment and support for those who struggle with it.