Going by the amount of ash I see overflowing from the officially unused ashtray on the left side of the 738 cockpits for that certain Irish airline, there is either a small number of chain smokers amongst the Captains or a few VERY heavy smokers!! In this day and age I find it unbelievable that a Captain could be so selfish ( and addicted) that he or she would inflict this habit on an unwilling copilot. For those of you not familiar with Mr Boeing's best selling aircraft-- the cockpit is the size of a small broom cupboard! Since seeing this thread I have asked quite a few of the copilots and it seems that we have quite a number of extremely selfish Captains-- even including some training Captains who should know better!