My Godmother used to smoke loads. I don't know exactly how many maybe 30 a day?? She had a heart attack last year and when she came out of the hospital she never smoked again.
Although it probably wasn't just the smoking that caused the heart attack. She's been running herself ragged for years! Always staying late and work and being the only one in the family who visits her elderly mother.
She works too hard. The heart attack was her body's way of telling her to slow down.