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Waiting in line to get a free ticket does not involve any opportunity cost.
Serotonin Dependence
A condition not widely recognized in medical terminology, but may refer to a reliance on mechanisms that enhance serotonin levels to regulate mood.
Physical Dependence
The physiological need for a drug that causes unpleasant withdrawal symptoms such as physical pain and a craving for the drug when it is discontinued.
Psychological Dependence
The strong desire to repeat the use of a drug for emotional reasons, such as a feeling of well-being and reduction of stress.
Drug Addiction
A chronic disease characterized by compulsive, or uncontrollable, drug seeking and use despite harmful consequences and changes in the brain, which can be long-lasting.
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