Just for the heck of it, I once lighted and stood on its end a Merit cigarette to watch it as it burned; it only took 8 minutes for it to burn down to the filter.
Merits are more air than tobacco.
Well, I, for one, am sick and tired of cigarettes getting such a bad rap for "causing fires." For one thing: if a person is THAT TIRED, they have NO business to lay in bed and have that "last cigarette" before retiring anyway.
Plus, most of fires from cigarettes are from people that are very intoxicated and they fall asleep or "pass out" in bed. Or else, spaced out on drugs. A sober, responsible person will never die in a house fire caused by a cigarette.