Which of the following is a common physical indicator of cannabis influence?

Bloodshot eyes are a well-documented physical indicator of cannabis influence. When someone uses cannabis, the active component, THC, causes blood vessels in the eyes to expand, leading to an increase in blood flow and a noticeable reddening of the sclera (the white part of the eye). This change is often one of the most recognizable signs of cannabis use and is frequently noted in both informal and clinical observations of individuals under the influence of cannabis.

Clean skin and increased energy are not established indicators of cannabis use; in fact, users may exhibit the opposite effects. While elevated heart rate can occur with cannabis consumption, it is less visually obvious compared to the striking appearance of bloodshot eyes, making it a less reliable physical cue in casual observations. Thus, bloodshot eyes are the most definitive and common physical sign indicating that someone may be under the influence of cannabis.