Your game wil mess up bad, freezing, invisibe streets, etc. It might take a good while to mess up, but it will, it's like a slow virus. I've found a way to get past it though. Just create a new game w/out using any cheats and have it to load when ur cheat game crashes. The catch22 is that everytime you beat a mission on ur cheat save, you'll have to go beat it on the safe one to use it as a backup. Tell me if this helped ya out any.