Which of the following is NOT a symptom of alcohol poisoning?

A happy demeanor is considered to be not a symptom of alcohol poisoning because, typically, alcohol poisoning is characterized by severe impairment and distress. Symptoms of alcohol poisoning include confusion, slow breathing, and pale skin, all of which indicate serious physiological effects of excessive alcohol intake.

Confusion is a common symptom, as the central nervous system becomes heavily affected at high blood alcohol levels. Slow breathing can occur because alcohol depresses the respiratory system, leading to dangerously low breathing rates. Pale skin is another severe indicator as it can result from poor circulation and oxygen deprivation due to the body's reaction to high alcohol levels.

In contrast, a happy demeanor may be aligned with initial intoxication effects, where individuals may appear to be cheerful or euphoric. However, this feeling does not correlate with the critical state that alcohol poisoning represents, making it the correct answer in identifying a trait that is not associated with alcohol poisoning symptoms.