Which symptom is associated with cannabis use?

The association of red eyes with cannabis use is a well-documented phenomenon that occurs due to the way THC, the psychoactive component of cannabis, affects the body. When cannabis is consumed, it causes blood vessels to dilate, leading to increased blood flow and a subsequent reddening of the eyes. This physiological response is a common side effect experienced by many users and serves as a visual indicator of cannabis consumption.

The other symptoms listed do not align with the typical effects of cannabis. Increased coordination and enhanced performance in complex motor tasks are generally not associated with cannabis use; it often hampers motor skills and coordination. Additionally, while some individuals might feel stronger under the influence of cannabis due to altered perceptions, heightened strength is not a recognized effect of its use. Thus, red eyes remains the most definitive and observable symptom correlated with cannabis consumption.