Smoking in Las Vegas casinos and hotel rooms used to be quite common, much like cheap buffets. While puffing away is still widely allowed on casino floors in Sin City these days, it has been nearly banned everywhere else. Most Vegas resorts no longer offer smoking rooms when you’re booking online, but that doesn’t mean they’re completely off-limits. In many places, smoking rooms are still available upon request. For example, Caesars Palace allows guests to book smoking rooms online while most of their other properties do not. MGM Resorts largely phased out smoking rooms nearly ten years ago, but Caesars…