Which of the following statements define withdrawal?

Withdrawal is defined as the physiological and psychological symptoms that occur when an individual who has become dependent on a substance, such as drugs, suddenly stops using that substance. The body has adjusted to the presence of the drug, and when it is no longer available, the body reacts negatively as it tries to return to its normal state without the substance.

This process can include a variety of symptoms, which may vary in intensity and duration depending on the substance involved and the extent of the user's dependence. The key aspect of withdrawal is the body's struggle to function without the drug it has become accustomed to, highlighting the physical and psychological dependency that can develop with drug use.

The other statements refer to different aspects of drug use and abuse but do not capture the specific definition of withdrawal. For instance, abusing drugs or switching from one substance to another does not inherently lead to withdrawal – it's the sudden cessation of a substance after prolonged use that triggers the withdrawal process.