Which symptom is a common sign of cannabis intoxication?

The correct answer is euphoria, which is a well-documented symptom of cannabis intoxication. When individuals consume cannabis, they often experience heightened sensations of pleasure and enjoyment, which can manifest as feelings of euphoria. This is primarily due to the psychoactive effects of tetrahydrocannabinol (THC), the main active compound in cannabis, that interacts with the brain’s endocannabinoid system, leading to altered mood states.

Tachycardia, while it can occur with cannabis use, is not as universally recognized as a primary symptom as euphoria is. Muscle weakness and seizures are not typical effects associated with cannabis intoxication; in fact, seizures are more commonly linked to withdrawal from certain substances or as a symptom of other medical conditions. Thus, euphoria stands out as the hallmark symptom of cannabis intoxication, making it the most appropriate answer in this context.