This picyture was posted by some stupid person who is responsible for dive center marketing. I would fire such person immediately because he/she does not understand that this is a very bad publicity.... if i see that diving center instructors and all they students smoke i might get impression that this dive center does not look into diving and safety very seriously. At least i would avoid such dive center.
You may be looking at it wrong. They may have posted it specifically so people with knee-jerk reaction to others' smoking would go dive with somebody else.