I never smoked, though my dad liked his pipe. Grandfather pipe smoked as well, everyday. He lived into his 90s. My dad has mostly given it up.
I credit my high school tennis coach for telling us as freshmen, if you're caught smoking in or out of school, around town, etc. you're off the team. Permanently.
I think what he was really doing was giving us a solid excuse to use if confronted with a peer to smoke. Once in college, being a non smoker was easy enough. As a result, no pot use with either.
Let me tell you, when I landed in the hospital last year at 45 with pneumonia and the doc said, "You're not a smoker, you'll have a quick recovery once the antibiotics do their thing.", I felt really good about my choices.