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.
Video games do not kill brain cells. Radiation and toxic substances such as alcohol kill brain cells. Video games are however one of the leading causes of lethargy, obesity, carpal tunnel syndrome and more. These however are not caused by video games but by the weak mental fortitude of many whom play them for too long without proper rest, exercise and proper dietary intake.