A LOT OF PEOPLE, THAT'S WHO! They help you when you work out, and they are just good to have because they lower your stress, too!
People drink energy drinks because it gives them the strength that they need to face the day with full of energy...
Its not dangerous but not entirely safe. It is dangerous if you drink a lot in one day or you have 2 every day. It is dangerous if you mix with alcohol.
Possibly drinks containing ginseng.
It gives you a boost at first, but you really smash at the end, this is bad for your body. So no!