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A few international airlines such as Air Algeria, Cubana and Iran Air still allow smoking in certain sections on their flights, which is why most of the signage remains on domestic airliners today

But not all countries have made such progress

Much like standing up straight or chewing with your mouth closed, the rules of smoking etiquette might seem small in isolation, but they are part of that same quiet agreement that keeps us functioning together as a society

As Healio previously reported, this research group found that in adulthood, the risk for COPD rose with regular cigarette smoking starting before age 15 years in a study published in American Journal of Respiratory and Critical Care Medicine