I dunno. Crows are smart. They might just pick up similar things (a bit of twig) to get the food. ...Or folks might simply start dumping butts accumulated in their homes or cars to “help ‘em out.”
Neat idea, though! Curious to read how it all shakes out when it its tor-real.
One morning on my way to work there was a crow on the power line holding a flip top cigarette box in his beak!