"I'll take the Effing Obvious for $100, Alex" Headline of the Week

Long-Time Pot Users Show Mental Deficits
NEW YORK (Reuters Health) - Long-time, heavy marijuana users may eventually see their memory and attention span go up in smoke, new research suggests.
...The findings show that over time, marijuana smoking can cause intellectual impairments that "endure beyond the period of intoxication" and worsen the longer a person uses the drug, the study authors report in the March 6th issue of The Journal of the American Medical Association.

On the other hand, it makes it that much harder to become a long-time heavy marijuana user if you can't remember where you hid your stash...

(Drawn to my attention by Asparagirl.)