"Higher than a kite" is an idiom commonly used to describe someone who is extremely intoxicated or under the influence of drugs. However, it's important to find alternative phrases to express the same meaning without promoting substance abuse. Synonyms for this phrase include "out of it", "stoned", "blitzed" or "zonked". These phrases convey the idea of being excessively under the influence, but in a more responsible manner. Remember, language has a powerful impact, and by using less derogatory terms, we can promote a healthier and more inclusive dialogue about the topic.