Electronic cigarette might be an option on some non-smoking non-US flights. The best is to ask to cabin members:

Flight attendant: Would you like something to drink?

Me: Yes, I would like apple juice, and may I ask you a question?

Flight attendant: Sure

Me: Is it OK if I use my nicotine inhaler on the plane? [I then show them my pen-style e cig]

Flight attendant: Nicotine inhaler? I don’t know. What is that?

Me: It’s a source of nicotine for smokers similar to nicotine gum or the nicotine patch. It is completely legal on airplanes and not affected by smoking bans, but I always ask because sometimes when I exhale a mist may come out of my nose and mouth and I don’t want other people to think that I am smoking. The mist is just water vapor that delivers nicotine to my lungs. May I show you what I am talking about?

EDIT: The quoted article dates back 2009. As e-cigarettes become more popular, this answer may be less acurate.

Electronic cigarette might be an option on some non-smoking non-US flights. The best is to ask to cabin members:

Flight attendant: Would you like something to drink?

Me: Yes, I would like apple juice, and may I ask you a question?

Flight attendant: Sure

Me: Is it OK if I use my nicotine inhaler on the plane? [I then show them my pen-style e cig]

Flight attendant: Nicotine inhaler? I don’t know. What is that?

Me: It’s a source of nicotine for smokers similar to nicotine gum or the nicotine patch. It is completely legal on airplanes and not affected by smoking bans, but I always ask because sometimes when I exhale a mist may come out of my nose and mouth and I don’t want other people to think that I am smoking. The mist is just water vapor that delivers nicotine to my lungs. May I show you what I am talking about?

Electronic cigarette might be an option on some non-smoking non-US flights. The best is to ask to cabin members:

Fight attendant: Would you like something to drink?

Me: Yes, I would like apple juice, and may I ask you a question?

Flight attendant: Sure

Me: Is it OK if I use my nicotine inhaler on the plane? [I then show them my pen-style e cig]

Flight attendant: Nicotine inhaler? I don’t know. What is that?

Me: It’s a source of nicotine for smokers similar to nicotine gum or the nicotine patch. It is completely legal on airplanes and not affected by smoking bans, but I always ask because sometimes when I exhale a mist may come out of my nose and mouth and I don’t want other people to think that I am smoking. The mist is just water vapor that delivers nicotine to my lungs. May I show you what I am talking about?

Electronic cigarette might be an option on some non-smoking non-US flights. The best is to ask to cabin members:

Flight attendant: Would you like something to drink?

Me: Yes, I would like apple juice, and may I ask you a question?

Flight attendant: Sure

Me: Is it OK if I use my nicotine inhaler on the plane? [I then show them my pen-style e cig]

Flight attendant: Nicotine inhaler? I don’t know. What is that?

Me: It’s a source of nicotine for smokers similar to nicotine gum or the nicotine patch. It is completely legal on airplanes and not affected by smoking bans, but I always ask because sometimes when I exhale a mist may come out of my nose and mouth and I don’t want other people to think that I am smoking. The mist is just water vapor that delivers nicotine to my lungs. May I show you what I am talking about?