Just a couple of reasons for NOT smoking on aircraft.
Incidentally,I am a smoker,but agree with a total ban.
Have had several close calls over the years (all smoking related) most notably during a flight back from US to London during the night,when a passenger came to me and thought that the guy sitting next to her had fallen asleep whilst smoking.She wasn't sure as she had been dozing herself,and didn't know how long ago etc.,but it had been playing on her mind.We went down to see,woke everyone up,got down there with torches and sure enough,a 3 inch diameter hole in the carpet that was smoldering.
A fire can be out of control in under 30 seconds,and trust me guys & girls,you DON'T want a fire on board an aircraft!
Air quality on aircraft is poor anyway,why make it worse?
I was once on an 747-200 in the hangar (in the days BA allowed smoking) when the engineers did a manual test of the drop-down oxygen.Of all the overhead compartments in the smoking section (some 20 0r 25 panels over 6 or 7 rows),only TWO opened.This,apparently,was due to a build up of nicotine gunge which had effectively "glued" the panels up.
This would not go down well during a decompression,I can tell you!
The moral of the story is....if your'e on a flight that still allows smoking,don't sit back there.Or better still,take a non-smoking flight.
You know it makes sense!!!