Which of the following is a common sign of addiction?

Craving a substance is a well-established sign of addiction. This intense desire or urge to consume a particular substance often leads individuals to prioritize obtaining and using that substance over other important activities or responsibilities. Cravings can be triggered by various factors such as environmental cues, stress, or even the presence of the substance itself. This overwhelming compulsion reinforces the cycle of addiction, making it difficult for individuals to control their consumption or seek help.

In contrast, improved social interactions and increased productivity are not typically associated with addiction. Instead, addiction can often lead to social withdrawal or decreased performance in various aspects of life due to the negative impact of substance use on personal and professional responsibilities. Likewise, reduced tolerance tends to reflect a decrease in the body's response to a substance over time, potentially leading individuals to use higher amounts to achieve the same effects, which is a hallmark of addiction. However, craving distinctly encapsulates the psychological component of addiction, making it the most accurate indication among the options provided.