So I just recently found out what a smoking stone was. For anyone that has one one, do they work well? (ie. hold your j/blunt well, make it that much better, easy to use, etc.) For those of you who don't know what they are, (which I didn't about a half hour ago), its a piece of (usually) glass, about an inch or two long, that you put your joint or blunt into and then smoke from the other end to prevent burning your fingers and ruining it from moisture from your lips. Basically, are they worth buying for someone who smokes joints?