Sort of related to brain growth, but THC has also been shown to help prevent alzheimers by reducing build up of plaques in the brain that have been associated with it. CBD gets all the credit, but THC has plenty of good to offer too :)

As a Canadian I'm happy it will soon be legal here, and hope we see a lot more research done into what combinations of the 64 cannibinoid profiles help with what ailments. So much of our medical needs can be serviced by this one plant. Prohibition can't end soon enough.