I sell everything any successful Vape Shop does and some things with caution, meaning a newcomer is not walking out with a rebuildable on a Captain unless they insist and I can let them try it first. I don't want someone in the shop every other day having trouble building a coil because we can no longer build for insurance reasons or not knowing anything about resistance. I have people still using CE4's on a pass thru. So what! They don't smoke.