By the way Delta now has in there book that vaping isn't allowed on flights. I know because I was and the attendant came up to me and asked me to stop. I also then said its not smoke and I am not trying to give you a hard time but I would like to see where it says in writing that I can't. I only did this because it was a 6 hour flight and I hate flying as is actually I have a huge fear of flying and vaping helps calm me in some weird way lol. So she went and got the book and sure enough it clearly states that alternate forms of smoking isn't allowed on flights. I made a sad face and put it away. The attendant was very nice about it and said "I'm sorry its not my rules and I applaud you for trying to quit real cigs" and then gave me a free cocktail.