Tolerance: Tolerance refers to the need for increased amounts of a substance to achieve the desired effect because the body has adapted to its presence.
Withdrawal: Withdrawal occurs when an addicted person stops using a substance abruptly. It leads to unpleasant physical and psychological symptoms as the body adjusts to functioning without it.
Craving: Craving is an intense desire or urge for a specific substance that an addicted person experiences. It can be triggered by cues associated with drug use or simply by psychological factors.