To better understand my question, imagine the following experiment: you roll a cigarette, but you put in just half a tobacco and leave the rest of the cigarette empty. When you light up the cigarette (or actually the empty paper), it will start burning downwards, but the flame will stop once it reaches the line where tobacco starts. So how does the tobacco prevent the flame from continuing downwards and burning off all the cigarette paper around tobacco? I imagine it’s the same reason why the paper just doesn’t burn off before tobacco when you are smoking a normal cigarette.
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The paper burns slightly slower than the tobacco. This is evident when you “hotbox” a cigarette and it leaves an unburnt strip of paper on the bottom side.
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