What is a common psychological effect of addiction on individuals?

The correct answer highlights how addiction often leads to heightened anxiety and mood disorders, which are prevalent psychological effects on individuals struggling with addiction. As a substance use disorder develops, the individual may experience increased levels of stress, which can exacerbate feelings of anxiety and lead to mood swings or conditions such as depression. This shift can occur due to the brain's altered chemical balance resulting from prolonged substance use, impacting how emotions are regulated and perceived.

In contrast, the other options suggest positive psychological benefits that are typically not associated with addiction. For example, improved cognitive function and better interpersonal communication are unlikely outcomes of substance use, as addiction can impair mental clarity and strain relationships. Additionally, increased emotional stability is generally not characteristic of individuals facing addiction; instead, they often struggle with their emotions as substances disrupt their natural coping mechanisms.