What is often the first thing that changes when you drink or use drugs?

The first thing that typically changes when a person consumes alcohol or uses drugs is their good judgment. This alteration occurs because substances can impair the brain's decision-making abilities and critical thinking processes. When judgment is compromised, individuals may engage in risky behaviors or make uncharacteristic choices that they would normally avoid. This shift often leads to an inability to assess situations appropriately, which can result in dangerous consequences, whether in driving, social situations, or personal safety.

While changes in eyesight, reflexes, and coordination can also occur with substance use, these are generally secondary effects. Good judgment serves as a foundational aspect of safe decision-making and risk assessment, making it the most immediate and impactful change following substance use.