Everyones an expert in hindsight, hats off to the police for responding even though it was an electronic cig, could have been something else.
I went on holiday in 2009 and was in the airport toilets as I was pretty nervous, I looked under a cubicle door to see if anyone was in and there was a fellow with his feet the wrong way messing with a bag, he opened the door and left and I went in, he was Asian and when I went into the toilet he had left an empty Robinsons orange bottle in there which had melted around the rim quite bad, I thought it was a bit weird.
He must have left it in there as I'd been in that cubicle 2mins before I came back.
He was travelling alone and looked very nervous and was messing about with his laptop and bag.
I told security about him and nothing was done, nothing happened as about 5 minutes later his wife and kids joined him which sort of eased my mind as I was ready to throw him off the plane, nothing happened and me and the mrs had a lovely holiday in Cuba and the bloke and his family were in our hotel, me and the mrs just joked about it after.
I won't admit to being parnoid even though nothing happened, just vigilant.
Better safe than sorry.