You got your chickens and eggs backwards Paul.
Smoking doesn't make pool cooler. Pool makes smoking cooler.
The guys who created that joe camel billboard started out with the idea of "we're gonna have joe camel smoking" and then said "ok, but what's he doing while he's smoking? It has to be cool." ...and someone came up with "how about we show him shooting some 8-ball?"
Smoking is part of a certain scene or narrative, where someone can go slumming and enjoy their vices unapologetically. "I'm gonna smoke if I want, drink if I want, and just relax. I'm gonna hang out somewhere a little dangerous, and blend right in. I don't care what my parents or the Mormons think."
What we're talking about is hanging out at a bar. And what bar scene is complete without a bar box?
That joe camel ad doesn't do anything for pool. It helps bars. It encourages someone to hang out, socialize, drink, and have a smoke. It does not encourage them to pick up a stick if they currently have no interest in pool.