Drug abuse refers to the habitual and excessive use of drugs, both legal and illegal, in a way that harms the individual's physical and mental health as well as their social and economic well-being. This research area focuses on studying the causes and consequences of drug abuse, as well as developing prevention and treatment strategies to address the problem. Researchers in this field examine various aspects of drug abuse such as the biological, psychological, and social factors that contribute to it, the impact of drug abuse on individuals and society, and the effectiveness of interventions aimed at reducing drug abuse and its associated harm. Studies in this area often involve a multidisciplinary approach, drawing on fields such as psychology, sociology, medicine, public health, and criminology.