I used to fly the Singapore Air non-stop from Newark to S'pore and back. 18-19 hours. As another poster mentioned, my brain seemed to accept the fact that there wasn't going to be any nicotine flowing in and so I had no cravings.

I was peeved the one time I checked into a Marriott unaware that they changed the policy. The one I stay at most often, however, has a wing of rooms on the ground floor that have sliders to a small patio. This works out pretty well. No stinky room, and less consumption having to get up and go outside. At another property, they were happy to give me a room at the end of the hall next to a key-card access side entrance.

I do have a problem with airports that do not offer anywhere to smoke without having to trek out through security. The many that do offer some sort of facility show proof that it can be handled without intrusion on non-smokers.