Addicts frequently have one or more comorbid medical disorders, such as lung or heart disease, stroke, cancer, or mental health issues. Blood tests, chest X-rays, and imaging scans can all reveal the detrimental effects of chronic drug usage throughout the body. For instance, it is now widely accepted that cigarette smoke can contribute to a number of malignancies, that methamphetamine use can result in serious dental issues known as “meth mouth,” and that opioid usage can result in overdose and death. Additionally, some medicines, including inhalants, can harm or kill nerve cells in the brain as well as the peripheral nervous system (the nervous system outside the brain and spinal cord). Drug usage can make you more likely to get sick from infections. Sharing injectable supplies or engaging in risky behaviors like intercourse without using condoms can lead to the spread of HIV and hepatitis C, a deadly liver illness. After being exposed to microorganisms through drug injection use, endocarditis, a skin infection, and cellulitis can both develop. Do drug usage and other mental problems interact or cause one another? In many cases, drug addiction and other mental illnesses coexist. Addiction may occasionally occur before mental illnesses including anxiety, sadness, or schizophrenia. Other times, drug use can cause or exacerbate those mental health issues, especially in persons who already have preexisting vulnerabilities.