Drug Addiction (also known as substance use disorder) can be defined as a progressive disease that causes people to lose control of the use of some substance despite the worsening consequences of that use. Substance use disorder can be life-threatening. Addictions are not problems of willpower or morality. Addiction is a powerful and complex disease. People who have an addiction to drugs cannot simply quit, even if they want to. The drugs change the brain in a way that makes quitting physically and mentally difficult. Treating addiction often requires lifelong care and therapy.Drugs that are commonly misused include:· Alcohol.· Club drugs, like GHB, ketamine, MDMA (ecstasy/molly), and flunitrazepam (Rohypnol®).· Stimulants, such as cocaine (including crack) and methamphetamine (meth).· Hallucinogens, include ayahuasca, D-lysergic acid diethylamide (LSD), peyote (mescaline), phencyclidine (PCP), and DMT.· Inhalants, including solvents, aerosol sprays, gases, and nitrites (poppers).· Marijuana.· Opioid painkillers such as heroin, fentanyl, oxycodone, hydrocodone, codeine, and morphine.· Prescription drugs and cold medicines.· Sedatives, hypnotics, and anxiolytics (anti-anxiety medications).· Steroids (anabolic).· Synthetic cannabinoids (K2 or Spice).· Synthetic cathinone (bath salts).· Tobacco/nicotine and electronic cigarettes (e-cigarettes or vaping).