The amount of caffeine in most energy drinks is comparable to that in 1 to 2 cups of coffee . Comment: If mixed with alcohol -- a common practice among college students -- caffeine-laden energy drinks can prolong drinking sessions and mask the feeling of drunkenness , potentially raising the risk for dangerous binges and behavior . Energy drinks generated about $ 5 billion in U.S. sales in 2008 .
The amount of caffeine in most energy drinks is comparable to that in 1 to 2 cups of coffee . Comment: Energy drinks generated about $ 5 billion in U.S. sales in 2008 .