I was in Kadena, very horizontally involved with this Air Force C130 mech. Wow, I thought she is making some racket, Semper Fi! Then I realized it wasn't her, it was me. I could still run 3 miles in under 18, but I was wheezing. WHEEZING!
I loaded up the next day on an LST out of White Beach headed for Korea. Pure vanity made me quit, I wan't going to wheeze. I was sitting in the commander's cupola of an amtrac, we had just popped the hatches after driving of the stern ramp of an underway LST. I lit my last cigarette, smoked it to the filter and then flipped in to the sea. I looked at my radio operator old Lance Corporal Thompson and said, "I just quit smoking, you know what that means?" "Yeah, if I don't give you a cigarette when you ask for one I'll get my ass kicked, and if I give you a cigarette when you ask for one, I get my ass kicked."
Yep he was a fine Marine, and correct.
Since then, beyond the odd cigar, I haven't smoked in 20 years.