I've always been a strong believer that stuff like juice just brings out the person you are inside. if you are an asshole it just makes it more obvious. just like when some jackass beats up his girlfriend when he's drunk...was it the booze or the asshole that did it that you blame. you blame the asshole. if you are emotionally unstable to begin with you shouldn't do certain drugs. teenagers are frequently emotionally unstable.
another instance was when scientists 'proved' that fake breasts led to a higher rate of suicide...turns out a high risk of suicide led to getting fake breasts and actually decreased the rate of suicide and increased happiness. There are still lots of girls that get em and realize it didn't fix all their problems and make them popular so they off themselves.
Moral of the story:
take all 'evidence with a grain of salt and closely examine their methods of coming to that conclusion because they are often flawed in their assumptions.
If you're emotionally unstable don't do drugs, if you are a teenager don't do drugs, if you a hamster don't do drugs, if you are an emotionally unstable teenaged hamster don't do drugs.