Hand held hair dryer manuals have a warning:
DO NOT USE IN THE SHOWER!
Is that necessary? According to the lawyers it is.
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Yes, this is pretty much a “coffee is hot” situation.
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Like most silly signs and labels that people laugh at, the reason is usually to avoid lawsuits.
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My favorite is a sign that I saw a few years ago in a National Park trail head pit toilet warning people to not enter the pit.
Shhhh!!! You don’t want the “No Smoking Sign” industry people to hear you! You’ll wind up in the desert under 20ft of sand…
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With a quicksand warning sign next to you. You know, to avoid a lawsuit 
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All responses are pretty much in line of what I believed to be just a heads-up to even the most unaware smoker/passenger that may still float around present-day societies and occasionally pop up on an airliner..
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I’ve never smoked myself but I remember my dad getting up to join the back aisles maybe the last time in 1989 on AAL
Where outside the cockpit is the oxygen? AFAIK the oxygen you breath in the back when the mask comes down is created with a chemical reaction, not with huge oxygen tanks that take up space and weight…
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Smoking has been fully banned in the US in the year 2000. There were steps to full ban though. It was allowed on internaltional flights throughout the 90s and on longer domestic flights as well.
EDIT: China didn’t ban smoking until 2017, the neo was already in production a couple of years.
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None I hope 
Except maybe in Congo
its a reminder. people still attempt to secretly have a smoke on board. the reason they still have ashtrays its not an invitation to light up. its a place where a cigarette can be extinguished, aircraft operations are all about safety
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The last IATA Airline to allow smoking was Cubana which finally banned it in 2014.
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An ashtray in the lavatory of commercial aircraft is mandated by aviation regulations. It is the subject of at least two airworthiness directives in fact. The regulation is driven by several instances of fires occurring in aircraft lavatory trash containers caused by cigarette butts being improperly disposed of in the containers. The ashtray is provided for safe disposal.
The regulation dates back to a time when smoking was generally permitted on airline flights, (except in lavatories) and though smoking has been prohibited on airliners for many years, the ashtray regulation remains in effect.
The main reason is human nature. Despite warnings before every flight that “smoking in aircraft lavatories is prohibited, and disabling or interfering with lavatory smoke detectors is a federal offense”, there will still be those individuals who will try to get away with having a smoke in flight - despite the substantial fines or even jail time that could result.
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Probably a North Korean airline.
That would be hilarious if a totalitarian dictatorship famous for banning almost everything was the only place in the world that did NOT ban smoking on aircraft 
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Kim Jong Un smokes where he wants!
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They should just change the wording to “NO FARTING”. That would be useful.
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I remember a flight in a 747 where people hanging around at the bar on the upper deck smoking and drinking. A bit like in mad men
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