Anyone who's ever sat down to watch 1936 B-movie classic Reefer Madness will know that cannabis – otherwise known as 'Wacky Tobaccy', 'Devil's Lettuce', and 'That Yum-Yum' – is bad news.
And now, research by the University of Maryland School of Medicine has come to the conclusion that people who smoke cannabis on a weekly basis in their adolescence run a higher risk of developing attention deficit disorder and schizophrenia, according to the Independent.
Not only that, but permanent reductions in intelligence have also been noted.
They came to their conclusion after conducting an experiment on young mice, exposing them to low levels of marijuana for 20 days. They pinpointed 'cortical oscillations' in the brain, signifying that weed stunts the development of cognitive processes.
The same experiment was then conducted on older mice with different results, signifying that younger brains are more susceptible to the drug's effects.