Yeh smokings alowed in our cockpit but none of our FOs smoke. I gave up a few years ago. Only cig I cant give up is that magical post-coital one (I empty a single pack of Marlboros every 5 years!)
Anyway I usualy let the stews up for a fix. It lessens the potential for bitchyness down the back. Some of the more rabid anti-smoking FOs wind up the cabin a thousand feet when shes halfway through then returns it to the nominal cab altitude at 200-300fpm on the standby system. Quite effective really.
Smoking I dont mind. FARTING is a no-no!