Clumping clay is bad enough for them if they swallow enough of it while they are cleaning their paws. Why add more junk?
How much do you spend on your clay litter? How often do you change it? I bet if you figured it out you would find you are probably spending more on the clay than you would on a good pine or wheat or corn based litter that lasts a lot longer. A 35 pound (I believe) bag of Feline Fresh pine litter costs $42 plus tax at Pet Valu. You fill up the litter box and just replace the pine as it gets used. A large bag would last one cat for two to three months. There are smaller bags available as well. Swheat Scoop (wheat based) is cheaper and works as well. I just can't get over the smell of the wheat.
Lots of options out there.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!