After long-term use of a certain drug, the body has adapted to the drug. Once the drug is stopped or reduced too fast, the body's regulatory function is dysregulated, resulting in functional disorders, rebound and recovery of disease or symptoms, and aggravation of disease, which is called withdrawal adverse. The addiction and habit of drugs have long been known. However, due to the confusion in the use of the above two terms, it is necessary to determine a more scientific term. For this reason, the World Health Organization Expert Committee replaced the terms "addictive" and "habitual" with the term "drug dependence" in 1964, and in 1969, the World Health Organization Expert Committee became aware of drug dependence
The meaning of sex is described as follows: drug dependence is a mental state caused by the interaction between drugs and the body, sometimes including a specific state, showing a compulsive behavior and other reactions of continuous or regular use of the drug, in order to feel its mental effect, sometimes to avoid discomfort caused by drug withdrawal, and tolerance can occur or not occur. Drug users can become dependent on more than one drug. In short, drug dependence is a state of dependence on drugs caused by repeated (periodic or continuous) drug use, either psychologically or physiologically or both, showing a compulsive behavior and other reactions of continuous or regular drug use.