Emphysema: Types, Features Mnemonic

"Cigarettes Is Primary Problem":
  Types:
Centrilobular
Irregular
Pancinar
Paraseptal
Most important feature for each type (in order as above): Cigarrettes
Inflammation healed to scar
Protease inhibitor deficiency (a1-antitrypsin) 
Pneumothorax

•  "Cigarettes is primary problem" used since cigarettes is most common cause of emphysema.
  
•  Keeping P's straight: Pan is antitrypsin.