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If you look at the lungs of smokers after an autopsy... humans aren't born with a fag in their mouth. Their lungs are designed to inhale oxygen, not smoke.
Some people care more for their iphones or their cars than their own bodies. You don't see people filling-up the engines of their cars with harmful products that will clog-up the smooth running of the engine... even though spare parts for cars can always be found and bought... but it's not so simple to find spare body part donors once the lungs and heart, etc, are damaged and destroyed.
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