People who start using marijuana before the age of 18 and keep using it for years can cause lasting harm to their intelligence, attention and memory, new research has found.
Those who did not start using pot until they were adults did not show similar mental declines.
The discovery was made by a team of researchers from this country, Britain and the United States, analysing data from more than 1000 people enrolled in the Dunedin Multidisciplinary Health and Development Study, which followed around 1000 people born in Dunedin in 1972 and 1973 from birth to age 38.
The research was published today in the Proceedings of the National Academy of Sciences.
Those who started using cannabis in adolescence and used it for years afterward showed an average decline in IQ of 8 points when their IQ tests at age 13 and age 38 were compared.
Quitting pot did not appear to reverse the loss, lead researcher Madeline Meier, a post-doctoral researcher at Duke University, said.
I totally believe this too. I never touched the stuff in my teen years. Only trying it in my late 20′s. Which is why I am still brilliant (actually I’m just naturally dumb). But I know people who have been smoking since they were teens and I can vouch that they are indeed fucked in the head now. It’s fucking heart breaking. Pot is fun and good. But to think it does no harm is just plain retarded. It is addictive, it will fuck you up. But so will alcohol and playing in traffic. You just got to be sensible about it.