I've been u[FONT=Arial, Helvetica, sans-serif]sing regular Smoke tech Mega dual coil carts for a while and had no issues, bought a 3 pack of these and its a disaster. The first one I filled and let it sit for a while, added more liquid again let it sit for a while, hooked it up and took the first vape, it let a crack out of it and burnt a hole is the side of the wool, its tasted of burning since, it also feelings like I am sucking more air through it than vape, scared to open the other 2, maybe I should try and return them? Any one else had issues?[/FONT]