As long as you are using teflon pans in their intended role, there is no problem. Once the non-stick surface reaches a certain temperature, it starts to release fumes. For an adult human in a well ventilated kitchen, the danger from these is still extremely low.
Don't leave a non-stick pan sitting empty on an active burner.
Don't use a non-stick pan for deep-frying.
Don't use metal utensils (for lifespan of the pan, not danger to you).
Titanium is non-ferrous. Induction works through magnetic fields. If your pan was solid titanium I wouldn't expect it to work at all on an induction range. Since it is working slowly, there must be some other magnetic material underneath or inside the pan, but not enough to heat it properly.
For an induction range, you really need steel or iron pans. Solid aluminum and copper are also non-ferrous and won't work. From my understanding, the best pan is a tri-ply 18/10 steel pan. It has durable steel surfaces, and a layer of aluminum sandwiched in the middle to help distribute heat evenly through the pan. You can use pans with a non-stick surface as long as the base material is ferrous.