Also, try using the whip on your DBV without tubing (like a trumpet - as that's how the tubing comes in to contact with the DBV whip - since it's actually on the inside of the whip the stream of heat hits directly in to the tubing) and it can get pretty damn hot....
Without the tubing, it's a wand (glass bowl). And although glass heats up fairly slowly, it holds the heat for a while, so yeah, sucking on the end of the wand wouldn't be comfortable. But I think you'd be surprised to find out how quickly the temp drops just a short distance from the screen. Again, if it makes you feel safer, just get some Silcon brand silicone tubing from usplastic.com. It's cheap and the temp range is up to 500 F.