Pot makes you dumber, new study says

WASHINGTON Scientists tracked the cognitive abilities of 33 chronic marijuana smokers and found that regular use of the drug resulted in significant impairment while completing tasks like sorting playing cards.

The study found that the more marijuana the person used, the worse the impairment. Those who began smoking pot before age 16 performed the worst, suggesting that early use of the drug can cause more serious brain damage.

In a recent survey of Americans almost 26 million people admitted to smoking marijuana at least once during the year 2008.