Well I got a weber smokey mountain smoker for xmas. Smoked a brisket/pork butt/ribs/and a whole chicken...worked amazing tasted amazing. Well yesterday I smoked a brisket and 2 racks of ribs. I pulled the ribs off noticed that my water pan was low so I went to add water and puff a large cloud of smoke puffed out and then caught on fire. Then I pulled the lid off to check the brisket and then flames where every where. So I quickly put the lid on and shut all the vent holes and smothered the fire. So I am assuming it was just a grease fire....but how can I avoid this?