Don't drink 'em

What I mean by this tag line is that I personally don't drink them. But, according to the associated press, 31 percent of American teenagers do (That's nearly eight million U.S. teens). What are they? Energy drinks. Some of these drink concotions are served in containers that are only 2/3 the size of a regular soft drink can, yet have up to four times the amount of caffeine as a can of coke. Does