I know a lot of people, particularly those using higher PG mixes, tend to use open airflows. However, coming only recently to vaping from long years of smoking I still pefer my draw to be a little tight. I very often find myself using the lowest possible airflow. I usually vape a 60/40 or 50/50 PG/VG ,mix. Now my question is - am I maltreating my coils, am I flooding them and shortening their life? I ask because I went through two coils in as many weeks on my Kanger Geni. They may have been born under a bad star and if that is the case I will take it. But if I am doing something wrong I would also like to know and be advised about it. Thanks.