http://lifesabervaporizer.com/lsv-glass/glycerin-cooling/lsv-vapor-tamer.html for example. You put the thing in the freezer. Glycerine gets cold but doesn't freeze/expand and break. Run your vapor or smoke through it to significantly cool it off. Really really nice experience. But you have to remember to return it to the freezer after each use, and it might on occassion get condensation in the tubing which on the discontinued small one I got (2 of) actually totally blocks it up. New available ones have larger diameter tubing. Bigger is better I read somewhere on the internet, so it must be true. If you are looking for a much cooler experience, consider one or at least see what you can find on this interweb about them and see if it might be for you. They really really work nice to cool off much much much and I think give a much more pleasant taste. mod note: Back-to-back posts, merged. Please use the Edit button, thanks.