Which statement accurately describes a relapse in substance use?

A relapse in substance use is characterized by a return to problematic behaviors associated with alcohol or drugs after a period of improvement or sobriety. This often means re-engaging in habits that negatively affect a person's life and health, signifying that the individual has reverted to previous patterns of use that they had worked hard to overcome.

In contrast, the other options describe concepts that do not align with the defined nature of relapse. For example, a short period of sobriety or a temporary setback in behavior can indicate moments of uncertainty or struggle, but they do not specifically encapsulate the essence of relapse. Furthermore, maintaining a healthy lifestyle is the opposite of what a relapse entails, as it represents an ongoing commitment to wellness and recovery, not a regression into previously harmful behaviors.