[SvilleKid]

The technical term is "purging". You can do a search for purge and purging, and should find a number of threads. Just refrain from blowing too vigorously, as you can blow embers and burn holes in things!! BTW, when you do this to a cigar that has gone out, it is still called purging. you can actually ignite the purging gasses with a lighter when you are blowing out, for a neat flaming effect. However, this is not necessary for a purge to work. It may not even be desired, as it WILL produce higher heat at the burning foot area, and extra heat on the unburned tobaccos isn't necessary a good thing. But it's a neat effect, anyway. Just don't torch yourself or anyone/anything nearby!!