Identify a common sign of someone who is abusing drugs or alcohol.

A common sign of someone who is abusing drugs or alcohol is changes in behavior and withdrawal from friends. This behavior often reflects the individual's internal struggles as substance abuse can lead to a range of emotional and psychological issues. When someone is under the influence of drugs or alcohol, they may experience mood swings, irritability, and a general change in personality, which can affect their relationships. As a consequence, they might isolate themselves or pull away from friends and family, leading to a noticeable decline in social interactions.

In contrast, increased social interactions or improved academic performance may not be indicative of substance abuse; in fact, these could suggest the opposite, where the individual is managing their life well. Likewise, frequent volunteering for community services does not correlate with substance abuse behaviors, as engaging in positive activities may reflect a healthy coping mechanism rather than a symptom of drug or alcohol abuse. Thus, the significant changes in behavior and social withdrawal are key indicators to look for when assessing potential substance abuse.