I think this is all hit or miss. I haven't travelled to Mexico so I can't comment specifically on that. I have travelled a bit with my Vamo, eGo, and eRoll as backups. Most of the time it is no big deal. This last trip, the Vamo got a lot of attention coming home. No big deal on most flights but this time I got stopped. They wanted to inspect backs, run the Vamo back through xray by itself, ask a lot of questions, swipe it for bomb residue, ask more questions. I told them what it was and if necessary, I would be happy to turn it on and demonstrate. I would be glad for the last second nicotine! 
It seems to totally depend on the agent and the day. Good luck.
And interesting to hear that Mexico has banned this stuff. I did not know that.

It seems to totally depend on the agent and the day. Good luck.
And interesting to hear that Mexico has banned this stuff. I did not know that.