in Las Vegas – Smoking is permitted in the Budweiser Racing Track Lounge in the Esplanade Pre-Security area, enclosed slot-machine lounges (B, C, D, and E Gates), and designated outdoor areas near ticketing and baggage claim
No smoking inside
There are smoking rooms that are designated but you may have to walk a ways to get there
I believe there may be one smoking zone, but it may be exclusive to only one terminal.
No smoking inside the airport
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