Oh brain damage, that's physical damage to the brain, not like drinking killing brain cells (which it doesnt)
Smoking causes irreversible brain damage, hard hits to the head, being choked, birth defects, etc. All irreversible.
Some of those are real but ones like "brain cells don't grow back, alcohol kills brain cells, drugs put holes in your brain," are all fake to scare children
Actually weed does. The smoke kills lung cells. The lungs do not deliver enough oxygen to the brain because the hot and harmful smoke has killed the tiny air sacs that extract the oxygen from our breathe. When the brain loses oxygen the cells start dying.
I'm not sure of the story of alcohol but I'm sure all the alcohol in the blood going to the brain could have some repercussions.
I smoked weed every day all throughout high school, the media hypes it up. It's really not that bad for you. Now would I recommend an illegal substance? No, don't screw up your life with the law. I lucked out.
Weed is not as harmful as it is made out to be but it does its damage. It's basically the same as breathing smoke from a campfire. Just a little more kick lol.