I thought the airlines had banned e-cigs/vaping on all flights?!?
Officially, no airline permits vaping. It is NOT however, illegal. Only against company policy. MUCH difference between the two. Company policy is enforced by the stews. Keeping a very low profile so that it isn't apparent or cause any concern or consternation to fellow passengers is the secret to success. I was in the front row, right across from the jump seats on one leg. And I held my mod most of the time, even during service. They were certainly aware of what I was doing, and also aware that I was keeping it to myself. Nobody said a word, and I was treated respectfully.
In 2011 the Department of Transportation attempted to include wording in Chapter 14 CFR part 252 of the FAA regulations to explicitly include E-cigarettes in the smoking ban, but it was never implemented. I believe it was ruled that since it is a cessation device that does not produce smoke or require flame, it is outside of their jurisdiction. I saw it once, but I cannot find the ruling online again. Officially, the DOT claims that since nicotine is a "tobacco product", it is included. I am a private pilot, and I have read all of 14 CFR 252 and have serious doubts they could ever enforce it. Nobody has ever been arrested for vaping an ecigarette on a plane. One youth WAS arrested when he was asked to stop and became aggressive, posing a hazard to the flight. An entirely different category of offense.
Common sense, courtesy and discretion will go a LONG way if you attempt it. I was on 5 different flight legs round trip, and did not have a problem on any, and I vaped pretty much during the whole flight. Do NOT let your vapor rise above your seat. You could create panic, and you WILL go to jail for that.
Here is 14 CFR 252 (it starts about a paragraph down on the first page) :
14 CFR part 252
Here is a pretty accurate assesment, and comments, of the whole situation:
Link