Reinforcement: In the context of substance addiction, reinforcement refers to any stimulus or event that increases the likelihood of drug-seeking behavior.
Withdrawal Symptoms: Physical or psychological symptoms experienced when a person stops using a substance after prolonged use. These symptoms are often uncomfortable and can contribute to relapse.
Dopamine: A neurotransmitter that plays a key role in reward-motivated behavior. Drugs of abuse often increase dopamine levels, leading to pleasurable effects and reinforcing addictive behaviors.