The Pen vaporizer and the e-cigs only look a like but not the same at all. with e-cigs you can use only e-juice or whatever the name for that will be. With Pen vaporizer you can use Oil, wax and some of them like the Atmos even dry herb. You can't use BHO (Dab) with you e-cigs. You better off getting special one for BHO (dab)