The Science Of Why Marijuana Makes Your Eyes Red

By Sophie Geyrosaga

Marijuana use is indelibly associated with red eyes. Whether you’re familiar with this symptom from experience, friends who partake, or common wisdom — have you ever wondered how this happens? It’s not irritation from the smoke, but the body’s reaction to THC.

In this animated short, Sophie Geyrosaga explains how marijuana consumption may temporarily affect the circulatory system, dilating blood vessels in the eyes to the point that they might appear to be bloodshot.

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