My buddy said if I gamble PS4 my brain cells die, right?
I would say no.
Of course that's not true! And that's exactly why I'm going to sit in front of the PS again.
No, only if you believe everything someone tells you.
Yes and no. Brain cells always die, even if you play on the PS4. But that's not because of the PS4. Playing on a PS3 or eating a sandwich is also an irretrievable loss of life.
The decrease in brain cells is very small if the alcohol level is not too high. The reprogramming of the existing cells has more of an effect. If you are interested, search the internet for "computer game addiction behavior".