Professor Theodora Psaltopoulou warns about the severe impacts of alcohol on developing adolescent brains, even in small amounts. She highlights risks such as impaired consciousness, involvement in accidents, and potential use of illicit substances. Excessive or contaminated alcohol can lead to life-threatening conditions, emphasizing the parental role in educating children on these dangers. Emergency hospitalization may be necessary in cases of severe intoxication, underscoring the importance of awareness and prevention efforts from parents, schools, and authorities.