There is some anecdotal evidence that playing card games or other games in a manner where decisions are made quickly (with attempted accuracy) is indeed beneficial to a reduction in cognitive decline. However, to do so in a casino environment under normal circumstances, you would be wiping out any possible benefits because of both second-hand smoke and long periods of physical inactivity. If you have now found a casino environment that is completely smoke-free, then that changes part of the equation. Change the rest of it by getting up and moving around every 45 minutes or so. Additional casino health benefits can be found by parking as far away from the casino as possible, taking the stairs instead of the elevator, and of course, always being choosy at the buffet.