What substances kill brain cells?

Marijuana, LSD, shrooms, alcohol, salvia, breathing gasoline, ectasy, breathing bad air, holding your breath too long, sniffing paint,

To add to this and correct, For the record, marijuana does NOT kill brain cells. All studies done have shown no proof of it in any manner effecting your brain, the worst brain damage you could incur would be a lessening of short term memory, that's it.