Since you've established a friendly relationship with the guy, you may want to caution him about his negative advertising, especially when it has no basis in fact. "Unlike other butane-powered vaporizers, the GCV does NOT rely on the user inhaling the exhaust from butane gas." What vape 'relies' on the user inhaling butane exhaust in order to get vapor or even operate the vape? As worded, that's what he's saying, and it's not true of any vape. And after butane is fully processed, whether by torch flame or catalytic processing, there's nothing left but carbon dioxide, water vapor and heat. The only thing I'll give him is that there is some carbon remaining if a regular, non-torch flame is used. And with the catalytic system used by O&B, or a torch lighter, all the carbon is fully burned/processed as well.