Is smoking tea illegal for kids?

There seems to be a misunderstanding in your question. Smoking tea, whether it's regular or herbal, is not common practice. Tea is typically consumed by brewing its leaves or herbs in hot water and then drinking the resulting infusion. Smoking it would not only be unusual but also potentially harmful due to the inhaling of smoke. There are no specific laws that prohibit minors from smoking tea, but it's generally considered an uncommon behavior.