First, I'd like to say that these psychiatrists were obviously the typical "head shrinkers."

The test was on "a group that smoked at least five joints daily for at least the past 10 years (and, on average, 20 years)." Ha ha! I wouldn't be surprised if 5 joints a day for 20 years might shrink your hippcampus a bit. Cute little tiny hippo! That's a buttload of weed for a very long time!

What would happen if you drank five beers a day for 20 years? Five cups of coffee a day for 20 years? Five hamburgers a day? Five donuts? Anything taken to extreme for long periods of time is a bad idea.