Never smoked on a plane, but ....
why I remember during the Blitz being on watch in the dirigibles (please don't call them 'balloons'!) keeping a watch for the Hun. We'd be tethered 300-400 meters up by a couple of metal cables designed to give their old kites the ol' one-two. Well, back then, you were just amazed if you lived to see the dawn, so we thought nothing of smoking 2, maybe 3 cigars a night. Those were the days! A couple of good smokes in your jacket pocket, an extra scarf and a thermos of coffee against the cold and duty for your country in your heart. Ah to be young again. Of course, it helped to do a couple hits of acid before going up so that you didn't chite your pants and all.
They made a documentary about that time...
http://www.youtube.com/watch?v=5rKYL0tW-Ek