drink and shrink your brain?

According to CNN.com, a new study suggests that drinking might shrink your brain.  And not only that, women are more vulnerable: For men, only those who were heavy drinkers had a smaller brain volume than...

According to CNN.com, a new study suggests that drinking might shrink your brain.  And not only that, women are more vulnerable:

For men, only those who were heavy drinkers had a smaller brain volume than those who consumed little or no alcohol.

In women, even moderate drinkers had a smaller brain volume than abstainers or former drinkers.

I'm curious: Why do you think teens continue to drink, even when they're aware of the negative consequences?