Which of the following is NOT a symptom of Substance Use Disorder?

The choice of "Improved tolerance" as the correct answer indicates an understanding of substance use disorders and their associated symptoms. In the context of Substance Use Disorder, tolerance refers to the body's adaptation to a substance, meaning individuals may need to consume larger amounts to achieve the same effect. This is a symptom often seen in individuals who increase their usage as a means to counteract diminishing effects, rather than indicating an "improvement."

Impaired control, social impairment, and risky use are all recognized symptoms of Substance Use Disorder. Impaired control involves difficulty in limiting substance use, social impairment reflects negative impacts on personal and professional relationships, and risky use indicates continued substance consumption despite harmful consequences. Hence, these three are aligned with the characteristics of substance use disorders, while "improved tolerance" does not accurately describe a symptom but rather a consequence of increasing substance consumption.