Twins Study Finds No Evidence That Marijuana Lowers IQ In Teens (sciencemag.org)

sciencehabit writes: Roughly half of Americans use marijuana at some point in their lives, and many start as teenagers. Although some studies suggest the drug could harm the maturing adolescent brain, the true risk is controversial. Now, in the first study of its kind (abstract), scientists have analyzed long-term marijuana use in teens, comparing IQ changes in twin siblings who either used or abstained from marijuana for 10 years. After taking environmental factors into account, the scientists found no measurable link between marijuana use and lower IQ.

Comments

On the other hand

[OzPeter]

The people in Flint, Michigan are about to gain a first hand appreciation of what lead does to cognitive abilities.

Re:who cares?

[blind biker]

I understand your point, but as long as alcohol is legal, all the discussion about cannabis being "not as safe as some people make it out to be" are meaningless.