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After smoking if the cigarette is discarded to windy and dry place by smoker it will often case fire. And the length of the remaining cigarette is often about 5mm.
Making a 5mm fire-proof module with fire-proof fibre (ceramic fiber)and placing it between the tobacco leaves and cigarette butts. This fibre module will Prevent the burning tobacco leaf from burning the cigarette butts.
In this case,if a cigarette is discarded to somewhere after smoking it will not keep buring,because there is only the fire-proof module in the remaining 5mm cigarette and the fire will never reach the cigarette butts.