It is a good idea to quit now because excessive smoking may cause irreversible damage. Eat a healthy diet. Your body will begin to heal naturally.
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It can be reversible if treated immediately! It will take a long time to recover though.
No, one puff of one cigarette or Vapping device cannot damage your lungs. However, say you did one puff of a cigarette a day then over time yes this could damage your lungs.