It's not unimportant:

• Teenager dies in classroom of caffeine overdose after downing latte, energy drink and Mountain Dew
• Lethal Lemonade: Energy Drinks Aimed at Young People Linked to Deaths, Cardiac Risks, Lawsuits Allege
• This article talks about even relatively young mature adults dying both in the main story as well as in links to some others further down the article.

Yes, these people overdosed, but teens aren't exactly known for their self-control or lack of impulsiveness, so they may do similarly - especially given how so many tend to act like they're almost indestructible thanks to their youth-driven ability to heal more quickly.

There's nothing keeping kids from drinking multiple caffeine drinks as detailed in the links above, so at least ensuring that the drinks are low in caffeine will hopefully slow the intake enough to minimize the risk.