My mother smoked heavily since 1941 when she took it up in a munitions factory of all places. In january this year, aged 84, she went to hospital with a suspected heart attack. When she came out, she said that if she smoked again it would show ingratitude to the hospital staff, so she gave up instantly and hasn't smoked since, nor has she even considered it. She can't explain why she never did it years ago!

Cheers
Ray