i see kids drinking them all the time and dont really think they should be. i do drink them, usually 2 a day. a rockstar juiced in the a.m. and usually a monster mixxd in the late afternoon.
couple things i noticed about them, they are very addicting. i will tell myself dont stop to the gas station to grab one and end up doing it anyway. the other thing i notice (about monster anyay) is the warning on the can:
"consume responsibly: limit 3 cans per day, not recommended for children, pregnant women or peoplle sensitive to caffeine"
honestly they dont effect me, however i definetely think theres something in them other than caffeine that is addicting.