Well done!
I never saw my father smoke, ever. So I was quite surprised to hear him mention to someone else in my teens, that he did long ago; Then one day, he said he reached for a cigarette not long after finishing one, and he said, that's too much, and quit on the spot. That was evidently early to mid 20s for him. I think that was right about the time of the USA surgeon general's warning about cigarettes. About ten years later for him, mid-30s, and he got winded just pulling a deer up a hill when hunting, and he took up jogging, during lunch at work. He got pretty fit until hip problems in his 50s. I should have gotten him started on biking, but I was too focused on getting through college and then my own career.
I was lucky I never smoked. Dad never gave me or my brothers a talk about it. And smoking was common among folks in my high school. Just dodged a bullet I guess. That and drugs.