It's said about brain that, "use it or lose it" — now, question being, do you think if person plays brainless gambling games such as slots, dice for major part of his/her daily routine, will it make him/her dull?
Edit: "brainless" as in playing gambling games that does not require using brain, I thought it was clear especially given examples.
How major is this "major part of his/her daily routine"? If a person plays dice/slots for 12 hours a day, when does he go to work?
Are you suggesting that unemployed people with lots of free time are playing dice/slots/roulette/crash several hours per day?
How come those unemployed people have enough money to spend on gambling?
There were studies claiming that watching TV 10 hours per day makes you stupid. I don't know about how true those statements are, but there must be a little bit of truth here and there. If you think that slots and dice are brainless games, then maybe all traditional casino games are brainless(excluding poker). I don't know about a gambling game, where you have to use your brain in order to win the game. Most gambling games are based on luck, not on brains and IQ.