"We found it quite funny so we thought we'd share it," Mr Potter said.
The council posted the picture to its Smoking Not Our Future Facebook page and asked people to rate the "epic blooper": "On a scale of 1 to 10 how would you rate this as an epic blooper? 1 = not really and 10 = totally epic. ps. Stay in School."
Last night, almost 1500 had commented on the photo with many giving it a 10/10 on the blooper scale.
Mr Potter said they saw the humour in the unintentional error and given that the two-week campaign had only a week left to run, they decided to leave it as it was. "Sometimes you've just got to laugh at yourself, don't you?
"These days when someone takes a photo and sends it round, it's out in the viral world so you might as well laugh along with everyone else."