According to the National Institute on Drug Abuse (NIDA), "Many people don't understand why or how other people become addicted to drugs. They may mistakenly think that those who use drugs lack moral principles or willpower and that they could stop their drug use simply by choosing to. In reality, drug addiction is a complex disease, and quitting usually takes more than good intentions or a strong will."

This article provides information about the science behind drug abuse and addiction as well as factors that influences] an individual's risk for addiction.