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 DOES burn faster than tobacco. This is why you always see cigarettes with a red tip, that’s the tobacco still burning unwrapped by the paper.
But when you inhale you are feeding the fire oxygen. To the point where you have burned so much paper that when you stop inhaling the edge of paper is mostly no longer close enough to to the burning tobacco to catch fire. The paper is wrapped around unburnt tobacco so only the thin surface of the paper can get oxygen which isn’t enough to keep the fire going.
If you roll a cigarette badly you will very easily set the paper on fire too fast and your filling will drop out.
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