I don't know a single kid at my current high school or my past high school that was not allowed to drink coffee. I mean, kids literally come into school with starbucks cups and thermoses. My old school actually sold coffee in the morning to students. Furthermore, Caffeine in my opinion is a lot worse than nicotine, because it disrupts sleep a lot, and will cover up the symptoms of short term sleep well enough that someone will think they are fine when in reality they are chronically sleep deprived.