Illicit drugs include highly addictive and illegal substances such as heroin and methamphetamine. Opioids, cocaine, amphetamines, and cannabis are the most commonly used illicit drug groups in international statistics. Other illicit drugs, such as plant-based and synthetic hallucinogens, are included in international drug control treaties. The UNODC publication Terminology and Information on Drugs contains a … Continue reading Illicit Drugs: Types and Effects