a truck driver threw a cigarette out his window, I picked it up & tried it...didn't like it & haven't smoked since (about 32 years ago.) Pretty much the same thing with liver & brussels sprouts, though I've heard...but don't truly believe...that those things aren't as detrimental to one's health. I've done in the intervenining years a lot of running, some marathons and things like that, so I guess it's just as well.
On a related note, I'd say the vast majority of Japanese instructors/divers smoke (I live in Guam, and that's the clientele I deal with normally.) If you could invent a reg that would allow someone to smoke DURING the dive, your money worries would be over!