Heh, I've spent a lot of money for my own personal research on this. Unfortunately I didn't take notes.
It looks like they just interviewed 500 boys from age 6 to 20 and then concluded that the ones that drank had more impulsive behaviour. I would conclude that the ones prone to impulsive behaviour are more prone to drink rather then the alcohol was causing the behaviour.
Scientifically speaking they should have given 250 of 500 girls alcohol (because they're less prone to impulsive behaviour) and then monitored the results.
Honestly it was a scientific study. Don't arrest me.
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