The term "drug habit" refers to a recurring pattern of using drugs or medication, often characterized by compulsive and uncontrollable drug-seeking behavior. It can indicate an addiction or dependence on a particular substance, where the individual feels a strong need or desire to continue using the drug despite potential negative consequences. The phrase is commonly used in reference to illicit drugs such as cocaine, heroin, and methamphetamines, but it can also apply to prescription medications that are taken for non-medical purposes or in excessive amounts.