Chuck, I'm using ce4's on eGo Twists for about 2 weeks now and have no issues at all. Just screw'm on and vape. I'm using 3 different ones for 3 different juices, 1 for Bobas, 1 for Mad4, and another for snickerdoodle. The bobas is 100% VG and very thick, and the other 2 juices are 70/30 PG/VG.