Actually cannabis doesnt damage the brain. Cannabis kills no brain cells, the only brain cell it kills is called the Glioma Cell which is the only cell in the brain to turn cancerous. It's also not used by the brain to carry out any taske or make you feel and sensation, its not used.

And yes, while inhaling ANY smoke it harmful to some extent, cannabis smoke, from the plant matter and THC trichomes does not cause any cancer in a living cell.

Cannabis is harmless.