What is one sign of marijuana ingestion?

Bloodshot eyes are a well-documented sign of marijuana ingestion. This occurs due to the active ingredient in marijuana, delta-9-tetrahydrocannabinol (THC), which causes blood vessels to expand, leading to a noticeable reddening of the eyes. The effect is typically harmless and can occur shortly after consumption, making it a common and recognizable indicator of marijuana use.

While increased heart rate can also occur as a physiological response to marijuana, it is not as universally visible or recognizable as bloodshot eyes. Elevated anxiety may be a reaction for some users but varies widely among individuals and is not a consistent or definitive sign of ingestion. Dry skin does not typically correlate with marijuana use and is not a recognized symptom in this context. Therefore, bloodshot eyes serve as a quintessential and easily identifiable sign of marijuana ingestion.