Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Alpha-1 Antitrypsin Deficiency ?
    ### Response:
    Alpha-1 antitrypsin (an-tee-TRIP-sin) deficiency, or AAT deficiency, is a condition that raises your risk for lung disease (especially if you smoke) and other diseases.
                
Some people who have severe AAT deficiency develop emphysema (em-fi-SE-ma)often when they're only in their forties or fifties.
    