It is such a special study that I'm fairly confident that cannabis is safe for over-18 brains, but risky for under-18 brains” - Professor Terrie Moffitt, Institute of Psychiatry, King's College London

For more than 20 years researchers have followed the lives of a group of people from Dunedin in New Zealand.

They assessed them as children - before any of them had started using cannabis - and then re-interviewed them repeatedly, up to the age of 38.

Having taken into account other factors such as alcohol or tobacco dependency or other drug use, as well the number of years spent in education, they found that those who persistently used cannabis suffered a decline in their IQ.

"This work took an amazing scientific effort. We followed almost 1,000 participants, we tested their mental abilities as kids before they ever tried cannabis, and we tested them again 25 years later after some participants became chronic users".

Weed can be OK in small doses when your young, but chronic use at a young age stunt's you. ANy over use of anything isn't good.

Boots wrote: I think this is the key point. If someone were to publish a study which concluded that 13 year-olds that got pissed on Jack Daniels regularly didn't all turn out that well it wouldn't be much of a revelation.

Boots wrote: I think this is the key point. If someone were to publish a study which concluded that 13 year-olds that got pissed on Jack Daniels regularly didn't all turn out that well it wouldn't be much of a revelation.

wake_up_bomb wrote:
Similarly, downing copious amounts of aspartame laden fizzy pop can't be that good for young folks, either. You probably won't find many 'studies' about that, though.