> "If Parliament says smoking in Paris is illegal, it is illegal."

I'm not entirely sure if you yourself understand the context or real meaning of that phrase, but for others at least, it was NOT meant to highlight that Parliament has a burning desire or real ability to legislate outside of its jurisdiction!

Just that it has the legal authority to create any such law, and that the legitimacy of a law is not dependent on its moral content. It's merely a paraphrasing/summary of H.L.A. Hart's legal positivism.