I have to respond to a couple of posts that address smoking as only dangerous at certain times, or in certain parts of the aircraft.

There is flamable material in every part of the cabin. I would not put a lot of faith in flame resistant seat material. When the whip comes down, the metal of the aircraft will burn.

I have logged 5000 hours on DC-10-30CF in the past 14 years (military crewmember). There is no time, or place, in an airborne, pressurized vessel that an open flame and the resultant smoke is anything less than dangerous.

Just because it was tolerated for a number of years does not mean it is anything other than foolhardy and inconsiderate. Throw the book at them; no warning.