We have some great news, adult pot heads: weed doesn't make you stupid -- as long as you didn't start smoking it regularly until you're 18.
According to a recent study conducted by researchers at Duke University, kids under the age of 18 suffer a dramatic decrease in IQ if they smoke pot regularly before they hit adulthood. However, the study found no decline in IQ for people who hold off on becoming pot heads until they turn 18.
If you don't understand how this could potentially impact the debate over the legalization of/medical marijuana, you probably started smoking pot before you were 18.
The study tested the IQ of people at age 13 and again at age 38. A decline in IQ was only seen in subjects who smoked pot before they turned 18.