A person who sells or furnishes alcoholic beverages to a person of lawful drinking age does not thereby become liable for injury or damage caused by or resulting from the intoxication of such person. However, a person who willfully and unlawfully sells or furnishes alcoholic beverages to a person who is not of lawful drinking age, or who knowingly serves a person habitually addicted to the use of any or all alcoholic beverages may become liable for injury or damage caused by or resulting from the intoxication of such minor or person.