Both are correct. You could also ask: Excuse me, is smoking allowed in this restaurant? or Excuse me, do you know whether smoking is allowed in this restaurant?
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ForbesIf you asked an English teacher in England in 60's: "Can I leave the room please sir?" you would have been likely to have received the answer: "You can, but you may not."Yeah I think you can still hear that from some old speakers of English, but now it would probably be some kind of joke.