Look at the ingredients for the "Smart Sticks". If the main ingredient is trichlor or dichlor, then they do indeed contain CYA. And if you've been using them for that long, I'm willing to bet that your CYA levels are plenty high. A pool store should test CYA for you, although the results are going to be a ball-park figure at best. At least that would give you your starting point. What is the main ingredient in the shock?

Janet