That is pretty funny.
They could also leave a lit cigar in front of a fake doll on the bench.
Then put the video of them trying to fine them on YouTube. That will go viral.
Such people have no sense of humor, so before you can bust up their game, you have to frustrate their ability to persecute others. Only then can you turn them into objects of derision.
Smudge pots start the process effectively by both sending them on “wild goose chases”, and fooling students, faculty, and administration that their actions are ineffective, because they can “smell people smoking”.
Next, in frustration, the cigarette police become increasingly authoritarian and oppressive to innocent non-smokers, which breeds resentment. Other than searches and interrogations, they will likely start threatening innocent people who they think smell like smoke. “Suspects”.
Then is the very best time to make fun of them, because it will tap into the pent-up frustration.