Subway Ghost Picture

Jake had a ghostly experience at a Subway Restaurant. Check his ghost picture of a mist behind him...

"...about a year ago I was on a date in my local Subway restaurant, when I had my picture taken. I was sent the pic, and it seemed normal enough, until I noticed a white mist in the top right corner. No one was smoking when the picture was taken."

Subway ghost almost looks to have a head in the middle of it.  Was it someone watching their date?