Cigars you can put in your carry on. Cutters and lighter, if they are nice ones, I would suggest packing them in your checked bag if you have one. If no bag is being checked, bring cheap ones(that you won't mind loosing if they are found), or just buy cheap ones in Vegas.

There's a Davidoff shop in The Venetian if you didn't know already. Over priced; but, hey, it's Vegas.

Enjoy your trip. I love Vegas!