Most airports allow vaping but, most airlines don't. I'll only carry on an ego and some juice. If the TSA decides to get nasty, I won't be crying in the terminal. 
I've snuck and vaped on a plane before and I was pretty sure that no one really cared as long as I was discrete. Hold it in and no vapor comes out. I got on a flight to Las Vegas (I've been before. It was cool once.) today and when I get to my aisle seat there's a guy at the window but, the middle seat is empty. We cross our fingers while the plane fillls up. After a while, we can overhear the flight attendants talking about how that's the only seat left. Then a pilot in an airline uniform comes up and says, "Sorry guys, I'm taking that seat." I kiddingly say, "But, you can't, I won't be able to sneak hits off this thing." while pointing to the ego in my shirt pocket. He takes a second to realize what it is and goes, "Don't worry, I'll be sleeping the whole time."
I took 4 or 5 hits an hour. I held them in and was discrete. No problems at all. Oh and he wasn't asleep the whole time either.
I've snuck and vaped on a plane before and I was pretty sure that no one really cared as long as I was discrete. Hold it in and no vapor comes out. I got on a flight to Las Vegas (I've been before. It was cool once.) today and when I get to my aisle seat there's a guy at the window but, the middle seat is empty. We cross our fingers while the plane fillls up. After a while, we can overhear the flight attendants talking about how that's the only seat left. Then a pilot in an airline uniform comes up and says, "Sorry guys, I'm taking that seat." I kiddingly say, "But, you can't, I won't be able to sneak hits off this thing." while pointing to the ego in my shirt pocket. He takes a second to realize what it is and goes, "Don't worry, I'll be sleeping the whole time."
I took 4 or 5 hits an hour. I held them in and was discrete. No problems at all. Oh and he wasn't asleep the whole time either.
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