What is a common sign of narcotic influence?

Facial itching is often associated with narcotic influence because narcotics, such as opioids, can cause histamine release in the body. This histamine release can lead to sensations of itching or scratching, particularly noticeable on the face. It is a physical reaction that can occur even at lower doses of these substances, making it a common and observable sign.

In the context of drug influence, symptoms like dilated pupils, excessive laughter, or nervous energy relate more closely to other types of substances. For instance, stimulants generally cause dilated pupils and increased energy levels, while hallucinogens or certain social situations may trigger excessive laughter. Therefore, the unique association between facial itching and narcotics highlights its importance as an indicator of narcotic use.