Yeah, it can.Blowing makes everything bigger.

har dee har har You're increasing the amount of oxygen to the fire.

more oxygen. "For a fire to burn the thing that is burning has to be hot enough to partially vaporize it. A candle only produces a little heat (the wick concentrates the flame so that the heat produced melts and vaporizes the wax close to the wick) and it is easy to blow that heat away, allowing the wick to cool enough that the wax doesn't vaporize and burn. A bonfire, on the other hand, produces lots of heat. By blowing on it you reduce the heat only slightly (compared to the heat generated by the whole flame) and it doesn't cool enough to put the flame out. On the other hand, the bonfire uses up lots of oxygen. So much that very little oxygen penetrates to the burning wood. Most of the flame is above the wood, though it produces enough heat to decompose and partially vaporize the wood and support more burning. When you fan the flame (or blow on it) you force some oxygen closer to the wood and it burns hotter for a little bit (until the fresh supply of oxygen is depleted)." Source and further information: http://www.newton.dep.anl.gov/askasci/chem99/chem99462.htm Further information: http://www.answerbag.com/q_view/74862