How can dependence be psychological?

Psychological dependence is a term that describes the emotional or mental components of substance use disorder, such as strong cravings for the substance or behavior and difficulty thinking about anything else.

Explanation:

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Psychological dependence is a state that involves emotional–motivational withdrawal symptoms, e.g. anxiety and anhedonia, upon cessation of drug use or certain behaviours. It develops through frequent exposure to a psychoactive substance or behaviour, though behavioural dependence is less talked about.