Seeing Cigarette Smoke

I was recently on holidays, and I kept seeing cig smoke in the apartment, I kept looking around to see if someone had left a cig in the ash tray but there was never any there. It happened a good bit but there was never anything in the ashtray. I never smelt it.

Also some of our stuff would go missing and then all of a sudden turn up a gain or looked like they were hidden, for instance my perfume was missing out of my case and I unpacked and packed it again looking for it, I gave up because I thought I had lost it, when I went back into the room it was sitting on my case. Can some one explain this to me, I have never had an experience like this. I did get an uneasy feeling in the rooms but just tried to ignore it. Does anyone know what the smoke represents in anyway? Would it be something to do with me or someone else who was trying to contact me?

Thanks