1. Physical dependence
Drugs act on the human body, causing adaptive changes in the body's physical energy, forming a new equilibrium state under the action of drugs. Once the drug is stopped, the physiological function will be disordered, and a series of serious reactions, called withdrawal reactions, will cause people to feel very painful. In order to avoid withdrawal reaction, the drug user must regularly take the drug and continue to increase the dose so that drug users can not be separated from drugs.
2. Mental dependence
When drugs enter the human body, they act on the human nervous system, causing drug users to have a strong desire to use drugs, driving drug users to seek and use drugs desperately. Once mental dependence occurs, even after detoxification treatment, it is often several months or even years to fully recover the original physiological function after the acute withdrawal control is basically controlled.
3. The mechanism by which drugs harm the human body
The pain of this withdrawal response, in turn, has prompted drug users to do everything possible to avoid drug abuse. Some drugs are centrally stimulant in pharmacological action, destroying the nerve center of human beings.