There is already a protocol within EMIS that highlights overuse of inhalers.  You can find this by going into either Resource Publisher or Template Manager.

If you go into the EMIS library, navigate to the location seen below:

There you will find a protocol called "All patients receiving more than 6 SABA pMDI in a year".   To set this live, right hand mouse click on it and select "Status"->"Activate":

The protocol should now flag the appropriate patients in your system.