Report: Teens who smoke pot can damage memory, intelligence

Marijuana.

Teenagers who become hooked on cannabis before they reach 18 may be causing lasting damage to their intelligence, memory and attention, according to the results of a large, long-term study published yesterday.

Researchers from Britain and the United States found that persistent and dependent use of cannabis before the age of 18 may have a so-called neurotoxic effect, but heavy pot use after 18 appears to be less damaging to the brain.

Terrie Moffitt, a psychology and neuroscience professor at King’s College London’s Institute of Psychiatry, said the scope and length of the study, which involved more than 1,000 people followed up over 40 years, gave its findings added weight.

“It’s such a special study that I’m fairly confident cannabis is safe for over-18 brains, but risky for under-18 brains,” she said.

Before the age of 18, the brain is still being organized and remodeled to become more efficient and may be more vulnerable to damage from drugs, she added.

Moffitt worked with Madeleine Meier, a post-doctoral researcher at Duke University in the United States, to analyze data on 1,037 New Zealanders who took part in the study. About 96 percent of the original participants stuck with the study from 1972 to today, she said.

At age 38, all participants were given a battery of psychological tests to assess their memory, processing speed, reasoning and visual processing.

Those who had used pot persistently as teens scored significantly worse in most of the tests. Friends and relatives regularly interviewed as part of the study were more likely to report that the heavy cannabis users had attention and memory problems such as losing focus and forgetting to do tasks.


News
Entertainment
Sports
Lifestyle
International

Canadian charged in 'Heartbleed' attack on tax agency

OTTAWA (Reuters) - Canadian police have arrested a 19-year-old man and charged him in connection with exploiting the "Heartbleed" bug to steal taxpayer data from…

National

Every dog has his day in court, in…

(Reuters) - Call him juror K-9.A computer glitch is likely to blame for a summons that called a German Shepherd to report for jury duty,…

Local

Local politicians pressure DOJ to investigate Ramarley Graham…

On what would have been his 21st birthday, Ramarley Graham's mother joined elected leaders to ask the U.S. Department of Justice investigate his death.

Local

Muslim leaders welcome NYPD surveillance changes with degree…

Leaders and advocates praise the NYPD's move to shut down a unit tied to its Muslim surveillance program but say there's more left to do.

Television

Jim Rash talks 'The Writer's Room' and amazing…

For Jim Rash, as the fifth season of "Community" comes to a close, the second season of "The Writer's Room" begins.

Going Out

Tasty chicken and waffles in NYC

Try some soul food goodness around the city.

Television

'Dexter' star Jennifer Carpenter moves into producing role

The actress who played the title character's sister in "Dexter" is teaming up with producer George Stelzner to adapt Erika Hayasaki's book "The Death Class:…

The Word

Wahlburgers announce North America domination

Tuesday was a huge day for Donnie Wahlberg.

NFL

2014 NFL Mock Draft: Updated, new April version

2014 NFL Mock Draft: Updated, new April version

NHL

Flyers, Rangers meet in playoffs for 11th time

The Flyers and Rangers will start a new chapter in a historic rivalry.

MLB

Masahiro Tanaka dominates Cubs over eight shutout innings

Masahiro Tanaka certainly had no-hit caliber stuff Wednesday as he allowed just two bunt singles.

MLB

MLB Power Rankings: A's are baseball's best, Brewers…

MLB Power Rankings: A's are baseball's best, Brewers and Braves right behind

Wellbeing

Unexplained infertility may be caused by lack of…

Researchers have identified a protein on the egg's surface that interacts with another protein on the surface of sperm, allowing the two cells to join.

Tech

5 surprising facts about Google Glass

Your sex life could get more interesting.

Wellbeing

Cognitive skills begin to drop at age 24

But the news isn't all that bad.

Career

How to get a job at a startup:…

We talked to Tarek Pertew, one of the co-founders behind Uncubed, about how to get your dream job at a startup.