How does puffing on a joint/ cigarette keep it burning?
In: 5
Drawing air across a burning ember adds oxygen to the reaction and moves it towards the fresher unburnt fuel. Any combustion in too-stagnant air will eventually burn itself out. It doesn’t usually happen that way with bigger fires because the extra heat lets it spread on its own, and means convection refreshes the airflow. But small enough instances like the lit end of a cigarette might be so slow-burning that they need a little help to keep going.
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