While smoking marijuana is sometimes touted for its ability to dull pain, research has emerged showing that it also significantly dulls the mind – especially in teenagers. A new study of more than ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. (CNN) — A chemical that’s in a lot of ...

SYDNEY (Reuters) – A landmark study suggesting a link between cannabis use and a drop in teenage IQ may not have gone far enough in its research, with any falls in IQ more likely due to lower ...

NEW YORK — A new analysis is challenging a report that suggests regular marijuana smoking during the teen years can lead to a long-term drop in IQ. The author of the new paper says pot might not have ...

Marijuana permanently lowers IQ by several points in adolescents, according to research published in August. But a new study suggests that factors related to economic class and home life, not ...

About two dozen states have moved to loosen the reins on marijuana. The legal ground is shifting and a New York Times Sunday editorial tried to shake things up a bit further. For more than 40 years, ...

A missing copy of a region in chromosome 16, a mutation associated with autism, will always cause a 25-point drop in IQ, scientists say. Will the deletion cause autism every time? Not necessarily.

(CBS/AP) Teens who smoke marijuana frequently are more likely to experience a long-term drop in their IQ, according to a new study. That could be a potential pitfall for millions of teens, givenrecent ...

August 27, 2012 — Adolescents who start using cannabis persistently before the age of 18 years show a marked decline in measures of intelligence in adulthood even if they stop using the drug along the ...

(CNN) — A chemical that’s in a lot of household products may be hurting children’s IQ’s. Women who had a high amount of the chemicals called di-n-butyl phthalate and di-isobutyl phthalate in their ...

NEW YORK (AP) — A new analysis is challenging a report that suggests regular marijuana smoking during the teen years can lead to a long-term drop in IQ. The analysis says the statistical analysis ...