Been through LAS a number of times. They don't allow smoking inside. The terminal has 1 or more slot rooms caged off where smoking is allowed. Used them when I was on analogs. Last time I went through, I was vaping. Stopped at a bar for a few pre-flight bracers. Pulled out my PV & asked the bartender if it was OK. He said no problem. This was at a joint called Burke in the Box. They make some good Bloody Marys. Don't know about the other stores at LAS, but Burke is now on my A list. Just sayin'. Stop by & tell 'em I sent you.