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A man entered the smoking room at an airport to smoke a cigarette before the plane took off and when he left the room

A man asked him: How many cigarettes do you smoke a day?

Smoker: What is the reason for this question?

Man: If you had collected all the money you spent on those cigarettes, that plane on the runway would have been yours
Smoker: Do you smoke?

Man: No
Smoker: Do you own that plane?

Man: No
Smoker: Thank you for the advice, sir. I smoke and this plane is mine

The smoker is English billionaire Richard Branson