What term refers to overindulgence or dependence on substances, particularly drugs and alcohol?

The term that refers to overindulgence or dependence on substances, especially drugs and alcohol, is substance abuse. This concept emphasizes a pattern of harmful or hazardous use of psychoactive substances. It includes a range of behaviors such as consuming these substances beyond recommended limits, ignoring the negative consequences on one's health, relationships, and responsibilities.

Substance abuse is a profound issue that can lead to significant physical and psychological harm, often requiring intervention or treatment. In contrast, terms like substance tolerance and substance dependency have specific meanings within the context of substance use disorders. Tolerance refers to a person's reduced response to a substance after repeated use, whereas substance dependency implies a physical or psychological reliance on the substance. Substance use is a broader term that merely describes the act of consuming drugs or alcohol, without necessarily implying harmful patterns or consequences. Thus, substance abuse captures the essence of overindulgence and negative implications inherent in heavy use of these substances.