Final answer:
Psychological dependence is when an individual emotionally relies on a drug to feel well, associated with cravings and a desire to achieve a euphoric high. It differs from physical dependence, which has bodily withdrawal symptoms. Psychological dependence can lead to increased tolerance and drug dependence.
Step-by-step explanation:
When an individual needs a drug to maintain a sense of emotional well-being, this describes psychological dependence. Psychological dependence is an emotional, rather than physical, need for a drug, often used to alleviate psychological distress. Unlike physical dependence, which involves the body physically adapting to the presence of a substance, psychological dependence impacts a person's emotional state and is characterized by a strong desire or craving for a drug to achieve emotional balance or a sense of well-being.
Drugs that can cause psychological dependence often provide a euphoric high, delivering intense feelings of pleasure or elation which the individual may seek repeatedly. This may eventually lead to drug dependence, a condition where stopping the use of the substance can produce distinct withdrawal symptoms, and the individual may require more of the substance to experience the same effects, known as tolerance.