OK, I've heard so much hoo-ha and I want some other opinions. Is there any reason to use one cat litter over another? I mean, for health reasons. I got that Feline Pine litter for after Obi was neutered (vet said I needed to use something that didn't contain gravels that could get packed into the incisions) and really like it. When he urinates it activates the pine and house smells like wet pine!! Yay!! Plus, you can mulch or compost the used stuff. So, does anyone know of any health (mental or physical) reasons why I shouldn't continue to use this stuff?